(ねんかん)

ねんかん
counter
years (duration)
1. years (duration)
A counter for counting the duration of time in years. Emphasizes the span or period of time.
I lived in Japan for three years.
Annual sales are one million yen.
Using 年間 as 'annual'
I have ten years of experience.

年間(ねんかん) emphasizes duration over a period of years. It can also mean 'annual' or 'yearly' when used as a prefix. Compare with (ねん) which is used for counting years more generally ((さん)(ねん) = three years) or for naming years (2024年(にせんにじゅうよねん) = the year 2024).