定員
ていいん · teiin · JLPT N2 · noun
force
🛶 定 = fixed + 員 = member: a fixed headcount of staff or a boat's capacity
定 means fixed or set, and 員 means member or staff. Together they give a set headcount, the maximum number of people a vehicle or room can hold.
定 — roof 宀 + 正 (correct/upright, phonetic)
Originally written with 宀 (roof) over 正 (upright/correct), suggesting a household settled and orderly under its roof. Over time 正 simplified to 㐬-like form at the bottom, and the meaning shifted from 'settled home' to the broader senses of 'fix, stable, decide.'