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.
This new system demonstrated great efficiency in operations.
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'.