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English definition of “negate”

negate

verb [T]     /nɪˈɡeɪt/ formal
to cause something to have no effect : The increase in our profits has been negated by the rising costs of running the business .Useless and futile Grammar:NegationWhen we want to say that something is not true or is not the case, we can use negative words, phrases or clauses. Negation can happen in a number of ways, most commonly, when we use a negative word such as no, not, never, none, nobody, etc:Grammar:Forming negative statements, questions and imperativesGrammar:Negation: two negativesStandard English does not have two negatives in the same clause (double negatives). Words such as never, nobody, no one, none, nothing, nowhere, etc. already have a negative meaning, so we don’t need another negative with the verb:Grammar:Negative clauses with any, anybody, anyone, anything, anywhereWe don’t use not with some, someone, somebody, something, somewhere in statements. We use any, anyone, anybody, anything, anywhere:Grammar:Negation in non-finite clausesNon-finite clauses are clauses without a subject, where the main verb is in the to-infinitive form, the -ing form or the -ed form. To make the negative of a non-finite clause, we can use not.Grammar:Negative prefixes and suffixesWe use these prefixes most commonly in negation: de-, dis-, il-/im-/in-/ir-, mis-, non-, un-:Grammar:Negative adverbs: hardly, seldom, etc.Some adverbs (e.g. hardly, little, never, only, scarcely and seldom) have a negative meaning. When we use these at the beginning of the clause, we invert the subject and verb:Grammar:Negation: emphasisingWhen we want to emphasise something negative, we often use at all. We normally use at all immediately after the word or phrase we are emphasising:Grammar:Negation of think, believe, suppose, hopeWhen we use verbs like think, believe, suppose (mental process verbs) to express uncertainty about something, we usually use not with the mental process verb rather than with the verb in the following clause: negation     /-ˈɡeɪ.ʃən/ noun [U]
(Definition of negate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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