中堅 ちゅうけん
chūken

Noun

1. nucleus; backbone; mainstay; key figure

Noun
no-Adjective

2. medium-level; mid-level; middle-ranking; midsize

Noun

3. main body (of troops); crack troops; select troops

Noun

4. center field; centre field; center fielder; centre fielder

Baseball
Noun

5. athlete competing in the middle-number match in a team competition, i.e. second in 3-on-3, third in 5-on-5 (kendo, judo, etc.)