先日 (せんじつ) Japanese meaning

先日 (せんじつ) Japanese meaning | Kotomora

Kanji

この間あいだN4
この間 is casual and can point to a vaguer, sometimes slightly longer stretch of recent past than the more neutral 先日.
先せんだってN1
先だって means the same as 先日 but sounds a bit old-fashioned and is less common in everyday conversation.
先さき頃ごろN1
先ごろ is more formal than 先日 and typically appears in news reports or written announcements.
最さい近きんN5
最近 covers a broader, less precise recent period (weeks or months) whereas 先日 points to one specific day within the last week or so.

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この前まえ
先日 is a more formal, polite word for 'the other day' used in business or written contexts, while この前 is casual everyday speech.
先せん般ぱん
先日 is the common, everyday word for 'the other day', while 先般 is a stiffer, formal term used in official writing and business speech.
今こん度どN5
先日 only points to a recent past event, while 今度 can point to the recent past, the present occasion, or the future.

後ご日じつN2
後日 refers to a day in the future ('at a later date'), the opposite time direction from 先日 ('the other day').
近きん日じつN1
近日 points to the near future ('in a few days'), while 先日 points to the recent past ('the other day').

こないだplainN2
先日 is the formal, business-appropriate way to say 'the other day', while こないだ is the casual spoken version of the same idea.

前ぜん日じつN3
前日 means 'the day before (some event)' and is often confused with 先日 ('the other day, recently') due to the similar kanji and sound.
先さきほどN2
先ほど refers to minutes or hours ago (very recent), while 先日 refers to a somewhat more distant past such as a few days ago.

Compound of 先 (previous) and 日 (day), literally 'the previous day(s)'. The exact historical derivation is straightforward from the kanji meanings.