Definition of “infinitive” - English Dictionary

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“infinitive” in British English

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infinitivenoun [ C ]

uk /ɪnˈfɪn.ɪ.tɪv/ us /ɪnˈfɪn.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.

More examples

  • Most people start by learning the infinitive of a verb.
  • 'To quickly decide' is an example of a split infinitive.

(Definition of “infinitive” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“infinitive” in American English

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infinitivenoun [ C ]

us /ɪnˈfɪn·ə·t̬ɪv/

grammar the basic form of a verb, usually following "to" or another verb form:

In the sentences "I had to go" and "I must go," "go" is an infinitive.

(Definition of “infinitive” from the Cambridge Academic Content Dictionary © Cambridge University Press)