中葉|ちゅうようchuuyou[0]heiban (flat)

1. noun, adverbabout the middle (of an era)
2. noun, anatomymiddle lobe (right lung); median lobe (prostate)

• Synonym中頃なかごろNeutralPoints to the middle stretch of a period; at home in both speech and writing, and more common than 「中葉」, which leans historical and written.
• Related中間ちゅうかんNeutralStresses a position between two things or a midway stage; an everyday word, not tied to eras the way 「中葉」 is.
• Related半ばなかばNeutralMeans halfway through something, e.g. 「九月半ば」; used in speech and writing, focused on being partway along rather than on an era's middle.
• Related中ほどなかほどNeutralPoints to around the middle of a location or a span of time; fine in speech and writing alike, without 「中葉」's historical flavor.
• Antonym初期しょきWrittenWritten-style word for the opening stage of an era; sits at the opposite end from 「中葉」's middle period.
• Antonym末期まっきWrittenWritten-style word for the final stage of an era; sits at the opposite end from 「中葉」's middle period.

Use 「中葉」 for the middle of a historical era in formal writing, as in 「十八世紀中葉」. In everyday talk prefer 「半ば」 or 「中頃」; 「中ほど」 and 「中間」 cover middles of position or stage. The era's ends are 「初期」 and 「末期」.

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

1. ある時代じだいの半なかば。中頃なかごろ、中期ちゅうき。
2. 厚あつすぎず薄うすすぎない程度ていどの鳥の子とりのこ紙し。
3. 肺葉はいようで、右肺みぎはいの中部ちゅうぶの部分ぶぶん。