/-ʃənl; -ʃənl/
adj
1 of or having a function(1) or functions 功能的; 机能的; 职务上的; 有作用的; 有功能的
*a functional duty, title, office 职责、职称、职能
* a functional disorder, ie illness caused when an organ of the body fails to perform its function 机能紊乱.
2 practical and useful; not decorative 实用的; 非装饰性的
*functional furniture, clothing, architecture 实用的家具、衣服、建筑.
3 [pred 作表语] working; able to work 起作用; 运转; 能起作用; 能运转
*Is this machine functional? 这机器能用吗?
* I'm hardly functional if I don't get eight hours' sleep! 我要是不睡上八个小时就无法工作!

adj
designed to be useful rather than beautiful or attractive
≠ decorative
　buildings that are sensitively designed, not purely functional
something that is functional is working correctly
= operational
　By 2004, the Supertram is expected to be fully functional .
relating to the purpose of something
　The two departments have slight functional differences.
>functionallyadv