na-adjective
elective
Medical or technical term for a procedure or treatment that is planned in advance rather than performed as an emergency. Often used in contexts like 待機的手術 (elective surgery).
待機的手術は緊急手術と違って、事前に日程が組まれる。
Unlike emergency surgery, elective surgery is scheduled in advance.
Compound of 待機 (standby, waiting) + 的 (-like, -ive). The exact historical derivation is uncertain; the term is used in modern medical contexts.