一度に|いちどにichidoni[3]nakadaka (mid-high)

1. adverball at once
   一度いちどにひとつのことをするようにしなさい。↗

   Try to do one thing at a time.

• SynonymいっぺんにCasualColloquial. All in one go or all at once, as in 「いっぺんに覚えられない」. Very close to 一度に, but more casual.
• Synonym一気にいっきにNeutralIn one go, in one breath, as in 「一気に飲む」. Unlike 一度に, the point is not simultaneity but pressing on without stopping midway.
• Synonym一時にいちどきにWrittenWritten/formal prose for 'at the same time; all at once'. Rare in practice; everyday speech uses 一度に or 「いっぺんに」 instead.
• Synonym同時にどうじにNeutralFor things happening at the same time, as in 「同時に始まる」. Also a conjunction meaning 'but at the same time', a use 一度に does not have.
• Related一斉にいっせいにNeutralFor many people or things acting at the same moment, as in 「一斉に走り出す」 or 「花が一斉に咲く」. The point is simultaneous group action.
• Antonym少しずつすこしずつNeutralA little at a time, in small portions, step by step. The opposite of 一度に on whether something is done in installments or all in one go.
• Antonym徐々にじょじょにNeutralFor change or progress unfolding slowly and gradually. Opposes 一度に, which concentrates everything into a single moment or a single batch.
• AntonymだんだんNeutralRead 「だんだん」. Describes gradual, step-by-step change over time, as in 「だんだん寒くなる」 — the opposite of an all-at-once shift.

Use 「一度に」 for doing everything in one go or at a single moment, as in 「一度に二つ」. In casual speech say 「いっぺんに」; for pushing through without a break, 「一気に」; for many people or things acting together, 「一斉に」. The opposites are 「少しずつ」 and 「徐々に」.

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

1. 同時どうじに。一斉いっせいに。