多年|たねんtanen[0]heiban (flat)

1. noun, adverbmany years
   人々ひとびとはこの習慣しゅうかんを多年たねんの間あいだ続つづけてきた。↗

   They have practiced this custom for many years.

• Synonym長年ながねんNeutralThe most common everyday word for many years, as in 「長年の夢」; 「多年」 is the more written choice, as in 「多年の研究」.
• Synonym長期ちょうきNeutralLong-term, used mostly to modify nouns, as in 「長期休暇」 or 「長期入院」; 「多年」 is more written and stresses the number of years.
• Synonym積年せきねんWrittenWritten word for many long years, used chiefly of long-held grudges or hatred, as in 「積年の恨み」.
• Synonym永年えいねんNeutralLike 「長年」, it means long years on end; it is also common in written prose and is nearly synonymous with 「多年」.
• Related年月としつきNeutralRefers to the months and years as they pass, as in 「年月が経つ」; the emphasis is on the flow of time itself.
• Related長い間ながいあいだNeutralColloquial for a long stretch of time, as in 「長い間お世話になりました」; a natural spoken substitute for 「多年」.
• Related長期間ちょうきかんWrittenWritten style for a long period, as in 「長期間の入院」; it states the length of time objectively.
• Antonym短期たんきNeutralAntonym: short-term, the opposite of the many years expressed by 「多年」.
• Antonym一瞬いっしゅんNeutralAntonym: an instant, the very opposite of the long years 「多年」 describes.

In everyday speech, 「長年」 or 「長い間」 is the natural choice; 「多年」 itself belongs to written prose, as in 「多年にわたる研究」 and 「多年草」. Use 「積年」 for long-accumulated grudges, 「長期間」 for an objective long period, and 「短期」 for the opposite, a short term.

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

1. 長ながい年月としつき。長年ながねん。