原げん形けい不ふ定てい詞しげんけいふていしMeanings1nounbare infinitive; root infinitivegrammar›A grammatical term for the base form of a verb without 'to', used in English grammar contexts. Compare with to不定詞 (to-infinitive).See also: ｔｏ不定詞英えい語ごの原げん形
