同時|どうじdouji[0]heiban (flat)

1. nounsame time
2. prenominal modifiersimultaneous; concurrent; synchronous

• Synonym同時にどうじにNeutralAdverbial form of 「同時」, meaning at the same time; also works as a conjunction meaning 'meanwhile' or 'on the other hand'.
• Antonym逐次ちくじWrittenA written/formal word meaning one after another, as in 「逐次報告する」. Contrasts with 「同時」, which is about things happening together.
• Antonym別時べつじWrittenAnother time, or the moment of parting; rare in modern Japanese. Contrasts with 「同時」 in whether the time is the same.

Use 「同時」 for things happening at the same time, and 「同時に」 as its adverb; for doing things one after another, say 「逐次」 or 「順次」.

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

1. 二ふたつ以上いじょうのことが、同おなじ時期じきや時代じだいに行おこなわれること。
2. 時刻じこくが同おなじであること。