一期|いちごichigo

1. nounone's whole life; one's lifetime

• Synonym一生涯いっしょうがいNeutralNeutral. The whole span from birth (or a point in life) to death; also adverbial, as in 「一生涯忘れない」. 「一期」 now survives almost only in set phrases.
• Synonym畢生ひっせいWrittenWritten/formal. Devoting one's whole life to something, stressing a lifetime poured in; typical in 「畢生の大作」「畢生の事業」. 「一期」 is not used this way.
• Related人生じんせいNeutralNeutral. Life as lived — the course and experiences of being alive, stressing how one lives and one's fortunes. Not used in set phrases like 「一期一会」.
• Related生涯しょうがいWrittenWritten/formal. One's whole life, as in 「生涯学習」, or a particular stretch of it; far more common than 「一期」 and with a written flavor.
• Related一生いっしょうNeutralNeutral. The everyday word for one's whole life. 「一期」 today appears mostly in set phrases like 「一期一会」 and is rare on its own, with a written feel.

「一期」 now lives on mainly in 「一期一会」 and is rare alone. For 'one's whole life' the default is 「一生」; in formal prose use 「生涯」, as in lifelong 「生涯学習」; for a work or cause one pours a whole life into, 「畢生」. 「人生」 is life as lived.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. （いちご）一生いっしょう。生涯しょうがい。