volitional form; conjugation denoting volition
A grammatical term for the Japanese verb form expressing intention or invitation, such as 〜う or 〜よう. Used in linguistic and pedagogical contexts.
The 'う' in '行こう' is part of the volitional form.
In Japanese language education, the volitional form is sometimes called '意向形'.
Compound of 志向 (volition, intention) and 形 (form). The exact historical derivation is uncertain; it is a modern grammatical term.