() [, ]the range of functions that a computer or other electronic system can perform （计算机或电子系统的）功能◆People generally use only 10% of a program's functionality. 人们一般只使用 10% 的程序功能。◆a phone with email functionality 有电子邮件功能的电话
[] the quality in sth of being very suitable for the purpose it was designed for 实用；符合实际◆We carry out extensive tests to prove the functionality and reliability of the system. 我们进行广泛的测试以证明系统的实用性和可靠性。