- [uncountable]
the quality in something of being very suitable for the purpose it was designed for synonym practicality實用;符合實際 - [uncountable]
the purpose that something is designed for or expected to perform Topics Engineeringc2設計目的;設計功能 - [uncountable, countable] (
computing )計算機 the range of functions that a computer or other electronic system can perform (計算機或電子系統的)功能性 new software with additional functionality 有附加功能的新軟件