秋季|しゅうきshuuki[1]atamadaka (head-high)

1. nounfall season; autumn season

• Synonym秋あきNeutralThe everyday word for autumn and by far the most common, as in 「読書の秋」.
• Synonym秋期しゅうきWrittenRefers to the autumn period, especially school terms and courses, as in 「秋期講座」; 「秋季」 stresses the season itself.
• SynonymオータムNeutralLoanword for autumn, seen mostly in product and shop names; rare in everyday speech.
• Related秋日しゅうじつWrittenWritten, poetic word for an autumn day; it centers on a particular day in autumn rather than the season as a whole.
• Antonym春季しゅんきWrittenThe spring season; the counterpart that pairs with 「秋季」.

Use 「秋季」 for the autumn season in formal contexts, as in 「秋季大会」 and 「秋季例大祭」. In daily speech say 「秋」; for school terms and courses use 「秋期」. 「春季」 is its counterpart.

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

1. 秋あきの季節きせつ。