1.
years (duration)
A counter for counting the duration of time in years. Emphasizes the span or period of time.
年間 emphasizes the span or duration of time in years, and can also function as a prefix meaning "annual" or "yearly."
TWO USES:
1. Duration counter: 三年間住んだ (lived for three years) — emphasizes the full span
2. Prefix meaning "annual": 年間売り上げ (annual sales), 年間計画 (annual plan)
COMMON COUNTING:
- 一年間: one year (duration)
- 数年間: several years
- 十年間: ten years
CONTRAST WITH 年:
年 is the general counter for years (三年 = three years) and is also used for naming years (2024年). 年間 specifically stresses the continuous period or span.