Ambiguous là gì


Anh chàng nọ chạy thục mạng chạy theo một cái xe bus chở đầy khách du lịch, nhưng chiếc xe đổ dốc rất là nhanh.

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“Tạm ngưng đi.” Một người khách tốt nhất có thể bụng thò đầu ra hiên chạy dọc cửa số hét phệ với anh chàng “Cậu không đuổi theo kịp nó đâu, đợi chuyến sau vậy!”

“Ổn định cháu phải đuổi kịp ạ.” Anh nam nhi trẻ vừa nói vừa thở hồng hộc: “Vì cháu là bác tài xe kia mà.”



A word, phrase, or sentence is ambiguous if it has more than one meaning. The word ‘light’, for example, can mean not very heavy or not very dark. Words lượt thích ‘light’, ‘note’, ‘bear’ cùng ‘over’ are lexically ambiguous. They induce ambiguity in phrases or sentences in which they occur, such as ‘light suit’ và ‘The duchess can’t bear children’. However, phrases và sentences can be ambiguous even if none of their constituents is. The phrase ‘porcelain egg container’ is structurally ambiguous, as is the sentence ‘The police shot the rioters with guns’. Ambiguity can have both a lexical với a structural basis, as with sentences like ‘I left her behind for you’ cùng ‘He saw her duck’.

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The notion of ambiguity has philosophical applications. For example, identifying an ambiguity can aid in solving a philosophical problem. Suppose one wonders how two people can have the same idea, say of a unicorn. This can seem puzzling until one distinguishes ‘idea’ in the sense of a particular psychological occurrence, a mental representation, from ‘idea’ in the sense of an abstract, shareable concept. On the other hand, gratuitous claims of ambiguity can make for overly simple solutions. Accordingly, the question arises of how genuine ambiguities can be distinguished from spurious ones. Part of the answer consists in identifying phenomena with which ambiguity may be confused, such as vagueness, unclarity, inexplicitness với indexicality.

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1. Types of ambiguity

Although people are sometimes said to be ambiguous in how they use language, ambiguity is, strictly speaking, a property of linguistic expressions. A word, phrase, or sentence is ambiguous if it has more than one meaning. Obviously this definition does not say what meanings are or what it is for an expression lớn have one (or more than one). For a particular language, this information is provided by a grammar, which systematically pairs forms with meanings, ambiguous forms with more than one meaning.

There are two types of ambiguity, lexical và structural. Lexical ambiguity is by far the more common. Everyday examples include nouns like ‘chip’, ‘pen’ và ‘suit’, verbs like ‘call’, ‘draw’ với ‘run’, và adjectives lượt thích ‘deep’, ‘dry’ với ‘hard’. There are various tests for ambiguity. One test is having two unrelated antonyms, as with ‘hard’, which has both ‘soft’ và ‘easy’ as opposites. Another is the conjunction reduction test. Consider the sentence, ‘The tailor pressed one suit in his phòng trưng bày và one in the municipal court’. Evidence that the word ‘suit’ (not béo mention ‘press’) is ambiguous is provided by the anomaly of the ‘crossed interpretation’ of the sentence, on which ‘suit’ is used to refer khủng an article of clothing và ‘one’ phệ a legal action.

The above examples of ambiguity are each a case of one word with more than one meaning. However, it is not always clear when we have only one word. The verb ‘desert’ và the noun ‘dessert’, which sound the same but are spelled differently, count as distinct words (they are homonyms). So vày the noun ‘bear’ và the verb ‘bear’, even though they not only sound the same but are spelled the same. These examples may be clear cases of homonymy, but what about the noun ‘respect’ cùng the verb ‘respect’ or the preposition ‘over’ cùng the adjective ‘over’? Are the members of these pairs homonyms or different forms of the same word? There is no general consensus on how to draw the line between cases of one ambiguous word với cases of two homonyous words. Perhaps the difference is ultimately arbitrary.

Sometimes one meaning of a word is derived from another. For example, the cognitive sense of ‘see’ seems derived from its visual sense. The sense of ‘weigh’ in ‘He weighed the package’ is derived from its sense in ‘The package weighed two pounds’. Similarly, the transitive senses of ‘burn’, ‘fly’ cùng ‘walk’ are derived from their intransitive senses. Now it could be argued that in each of these cases the derived sense does not really qualify as a second meaning of the word but is actually the result of a lexical operation on the underived sense. This argument is plausible bự the extent that the phenomenon is systematic và general, rather than peculiar mập particular words. Lexical semantics has the task of identifying với characterizing such systematic phemena. It is also concerned lớn explain the rich và subtle semantic behavior of common với highly flexible words like the verbs ‘do’ với ‘put’ cùng the prepositions ‘at’, ‘in’ với ‘lớn’. Each of these words has uses which are so numerous yet so closely related that they are often described as ‘polysemous’ rather than ambiguous.

Structural ambiguity occurs when a phrase or sentence has more than one underlying structure, such as the phrases ‘Tibetan history teacher’, ‘a student of high moral principles’ và ‘short men với women’, với the sentences ‘The girl hit the boy with a book’ cùng ‘Visiting relatives can be boring’. These ambiguities are said khủng be structural because each such phrase can be represented in two structurally different ways, e.g., ‘ teacher’ và ‘Tibetan ’. Indeed, the existence of such ambiguities provides strong evidence for a màn chơi of underlying syntactic structure. Consider the structurally ambiguous sentence, ‘The chicken is ready mập eat’, which could be used phệ describe either a hungry chicken or a broiled chicken. It is arguable that the operative reading depends on whether or not the implicit subject of the infinitive clause ‘lớn eat’ is tied anaphorically lớn the subject (‘the chicken’) of the main clause.

It is not always clear when we have a case of structural ambiguity. Consider, for example, the elliptical sentence, ‘Perot knows a richer man than Trump’. It has two meanings, that Perot knows a man who is richer than Trump và that Perot knows man who is richer than any man Trump knows, và is therefore ambiguous. But what about the sentence ‘John loves his mother với so does Bill’? It can be used béo say either that John loves John’s mother và Bill loves Bill’s mother or that John loves John’s mother với Bill loves John’s mother. But is it really ambiguous? One might argue that the clause ‘so does Bill’ is unambiguous với may be read unequivocally as saying in the context that Bill does the same thing that John does, với although there are two different possibilities for what counts as doing the same thing, these alternatives are not fixed semantically. Hence the ambiguity is merely apparent với better described as semantic underdetermination.

Although ambiguity is fundamentally a property of linguistic expressions, people are also said bự be ambiguous on occasion in how they use language. This can occur if, even when their words are unambiguous, their words vì not make what they mean uniquely determinable. Strictly speaking, however, ambiguity is a semantic phenomenon, involving linguistic meaning rather than speaker meaning; ‘pragmatic ambiguity’ is an oxymoron. Generally when one uses ambiguous words or sentences, one does not consciously entertain their unintended meanings, although there is psycholinguistic evidence that when one hears ambiguous words one momentarily accesses và then rules out their irrelevant senses. When people use ambiguous language, generally its ambiguity is not intended. Occasionally, however, ambiguity is deliberate, as with an utterance of ‘I’d like lớn see more of you’ when intended to be taken in more than one way in the very same context of utterance.

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2. Ambiguity contrasted

It is a platitude that what your words convey ‘depends on what you mean’. This suggests that one can mean different things by what one says, but it says nothing about the variety of ways in which this is possible. Semantic ambiguity is one such way, but there are others: homonymy (mentioned above), vagueness, relativity, indexicality, nonliterality, indirection với inexplicitness. All these other phenomena illustrate something distinct from multiplicity of linguistic meaning.

An expression is vague if it admits of borderline cases. Terms lượt thích ‘bald’, ‘heavy’ và ‘old’ are obvious examples, cùng their vagueness is explained by the fact that they apply béo items on fuzzy regions of a scale. Terms that express cluster concepts, like ‘intelligent’, ‘athletic’ với ‘just’, are vague because their instances are determined by the application of several criteria, no one of which is decisive.

Relativity is illustrated by the words ‘heavy’ cùng ‘old’ (these are vague as well). Heavy people are lighter than nonheavy elephants, và old cats can are younger than some young people. A different sort of relativity occurs with sentences lượt thích ‘Jane is finished’ với ‘John will be late’. Obviously one cannot be finished or late simpliciter but only finished with something or late for something. This does not show that the words ‘finished’ với ‘late’ are ambiguous (if they were, they would be ambiguous in as many ways as there are things one can be finished with or things one can be late for), but only that such a sentence is semantically underdeterminate–it must be used béo mean more than what the sentence means.

Indexical terms, like ‘you’, ‘here’ cùng ‘tomorrow’, have fixed meaning but variable reference. For example, the meaning of the word ‘tomorrow’ does not change from one day to the next, though of course its reference does.

Nonliterality, indirection cùng inexplicitness are further ways in which what a speaker means is not uniquely determined by what his words mean. They can give rise khủng unclarity in communication, as might happen with utterances of ‘You’re the icing on my cake’, ‘I wish you could sing longer với louder’, và ‘Nothing is on ti vi tonight’. These are not cases of linguistic ambiguity but can be confused with it because speakers are often said phệ be ambiguous.

3. Philosophical relevance

Philosophical distinctions can be obscured by unnoticed ambiguities. So it is important lớn identify terms that vị doubtle duty. For example, there is a kind of ambiguity, often described as the ‘act/object’ or the ‘process/product’ ambiguity, exhibited by everyday terms lượt thích ‘building’, ‘shot’ và ‘writing’. Confusions in philosophy of language và mind can result from overlooking this ambiguity in terms like ‘inference’, ‘statement’ và ‘thought’. Another common philosophical ambiguity is the type/token distinction. Everyday terms lượt thích ‘animal’, ‘book’ với ‘car’ apply both khủng types và khủng instances (tokens) of those types. The same is true of linguistic terms like ‘sentence’, ‘word’ và ‘letter’ và bự philosophically important terms like ‘concept’, ‘event’ cùng ‘mental state’.

Although unnoticed ambiguities can create philosophical problems, ambiguity is philosophically important also because philosophers often make spurious claims of it. Indeed, the linguist Charles Ruhl has argued that certain ostensible ambiguities, including act/object cùng type/token, are really cases of lexical underdetermination. Saul Kripke laments the common strategem, which he calls ‘the lazy man’s approach in philosophy’, of appealing lớn ambiguity béo escape from a philosophical quandary, với H. P.. Grice urges philosophers to hone the ‘Modified Occam’s Razor: senses are not khủng be multiplied beyond necessity’. He illustrates its value by shaving a sense off the logical connective ‘or’, which is often thought to have both an inclusive và exclusive sense. Grice argues that, given its inclusive meaning, its exclusive use can be explained entirely on pragmatic grounds. Another example, prominent in modern philosophy of language, is the ambiguity alleged mập arise from the distinction between referential và attributive uses of definite descriptions. Less prominent but not uncommon is the suggestion that pronouns are ambiguous as between their anaphoric và their deictic use. So, for example, it is suggested that a sentence like ‘Oedipus loves his mother’ has two ‘readings’, i.e., is ambiguous, because it can be used bự mean either that Oedipus loves his own mother or that Oedipus loves the mother of some contextually specified male. However, this seems béo be an insufficient basis for the claim of ambiguity. After all, being previously mentioned is just another way of being contextually specified. Accordingly, there is nothing semantically special in this example about the use of ‘his’ lớn refer mập Oedipus.

Claims of structural ambiguity can also be controversial. Of particular importance are claims of scope ambiguity, which are commonly made but rarely defended. A sentence like ‘Everybody loves somebody’ is said bự exhibit a scope ambiguity because it can be used to mean either that for each person, there is somebody that that person loves or (however unlikely) that there is somebody that everybody loves. These uses may be represented, respectively, by the logical formulas ‘(“x)(Ey)(Lxy)’ và ‘(Ey)(“x)(Lxy)’. It is generally assumed that because different logical formulas are needed lớn represented the different ways in which an utterance of such a sentence can be taken, the sentence itself has two distinct logical forms (see LOGICAL FORM). Sustaining this claim of ambiguity requires identifying a cấp độ of linguistic description at which the sentence can be assigned two distinct structures. Some grammarians have posited a cấp độ of LF, corresponding lớn what philosophers gọi logical form, at which relative scope of quantified noun phrases may be represented. However, LF of this kind does not explain scope ambiguities that philosophers attribute khủng sentences containing modal operators với psychological verbs, such as ‘The next president might be a woman’ và ‘Ralph wants a sloop’. An utterance of such a sentence can be taken in either of two ways, but it is arguable that the sentence is not ambiguous but merely semantically underdeterminate with respect khủng its two alleged ‘readings’.

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Notwithstanding the frequency in philosophy of unwarranted với often arbitrary claims of ambiguity, it cannot be denied that some terms really are ambiguous. The nouns ‘ngân hàng’ và ‘suit’ are clear examples, và so are the verbs ‘ngân hàng’ với ‘file’. Philosophers sometimes lament the prevalence of ambiguity in natural languages và yearn for an ideal language in which it is absent. But ambiguity is a fact of linguistic life. Despite the potentially endless supply of words, many words bởi vì double duty or more. And despite the unlimited number of sentences, many have several meanings, cùng their utterance must be disambiguated in light of the speaker’s likely intentions.

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