to不定詞つーふていしじ字FuriganaMeanings1nounto-infinitive; full infinitivelinguistics›Linguistics term for the infinitive form with 'to', as in 'to go'. Contrasts with 原形不定詞 (bare infinitive).See also: 原形不定詞英えい語ごの「to go」の「to」はto不ふ定てい詞しの一いち部ぶです。The 'to' in English 'to go' is part of the to-infinitive.