1.
two years; a two-year period
A duration of two years.
二年前に結婚した。
I got married two years ago.
彼は二年でこの仕事を覚えた。
He learned this job in two years.
プロジェクトの完成までに二年かかる予定です。
The project is expected to take two years to complete.
2.
second year; the second year
The second year in a sequence, such as a school year or program. Commonly used in 二年生 (second-year student).
高校二年のときに初めて海外に行った。
I went abroad for the first time in my second year of high school.
娘は大学二年生です。
My daughter is a second-year university student.
Means either 'two years' (duration) or 'second year' (ordinal position).
COMMON PATTERNS:
- 二年前: two years ago
- 二年後: two years from now
- 二年間: for two years (emphasizes duration)
- 二年目: the second year (ordinal)
- 二年生: second-year student
YEAR COUNTING:
Years use 年: 一年, 二年, 三年, 四年 (note: 四, not し), 五年.