noun
great efficiency; remarkable effectiveness
A somewhat formal or literary noun emphasizing outstanding results or performance. Often used in written contexts such as reports or evaluations.
この新システムは業務に卓効を発揮した。
This new system demonstrated great efficiency in operations.
彼の指導法は生徒の成績向上に卓効があった。
His teaching method was remarkably effective in improving students' grades.
Compound of 卓 (excellent, outstanding) and 効 (effect, efficacy). The exact historical derivation is uncertain, but the word is conventionally associated with the meaning 'great efficiency'.