一いっ世せTop 35000MeaningsNoun1. one generation (past, present, or future)2. a lifetimeOther spellingsいっせ19%Kanji used一one世worldPitch accentいっせUsed in vocabulary一いっ世せ一いち代だいonce in a lifetime; the first and last occurrence (event, experience) of one's lifetimeNoun