noun, noun or participle which takes 'suru', transitive verb
additional post; concurrent post
Refers to holding an extra position or duty in addition to one's main job, often in an organizational context. Used as a noun or with する.
彼は本社の仕事に加えて、子会社の役員も兼勤している。
In addition to his work at the head office, he also holds a concurrent post as a director of a subsidiary.
兼任 is more common and broadly means 'concurrent post' or 'serving concurrently'. 兼勤 is a less frequent synonym with a similar meaning, often used in formal or bureaucratic contexts.
Compound of 兼 (concurrently) and 勤 (work/service). The exact historical derivation is uncertain, but the word is formed from standard Sino-Japanese morphemes.