in ‧ fin ‧ i ‧ tive /ɪnˈfɪnətɪv, ɪnˈfɪnɪtɪv/ BrE AmE noun [countable] technical
[ Date: 1400-1500 ; Language: Late Latin ; Origin: infinitivus , from Latin infinitus ; because the verb is not limited by person or number ]
in grammar, the basic form of a verb, used with ‘to’ in English. In the sentence ‘I want to watch television’, ‘to watch’ is an infinitive.
⇨ ↑ split infinitive