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English definition of “infinitive”

infinitive

noun [C] uk   /ɪnˈfɪn.ɪ.tɪv/ us    /-ə.t̬ɪv/ specialized
B1 the basic form of a verb that usually follows "to": In the sentences "I had to go" and "I must go", "go" is an infinitive. "Go" is the infinitive form.
(Definition of infinitive from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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