infinitive
/ɪnˈfɪnətɪv; ɪn`fɪnətɪv/ n
(grammar)
1 basic form of a verb, without inflections, etc (in English used with or without to, as in he can go; ask him to go) （动词）原形, 不定式（无语尾变化等, 在英语中的用法为带to或不带to, 如he can go、 ask him to go）
a verb in the infinitive 原形动词
[attrib 作定语]
the infinitive form 不定式的形式.
2 (idm 习语) split an infinitive => split.