Meanings
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1
noun
The basic form of a verb, usually used with "to", as in "to run" or "to eat".
In the sentence "I want to leave", the infinitive is "to leave".
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2
adj
Relating to or formed with the infinitive form of a verb.
The grammar book explains the infinitive form in detail.
Thesaurus
Etymology
From Middle English infenitife (“without end, in perpetuity”), from Late Latin īnfīnītīvus (“unlimited, indefinite”), from Latin īnfīnītus (“unlimited, infinite”). By surface analysis, infinite + -ive.
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