functional
/ˈfʌŋkʃənəl/adjective
1
- of or having a special activity, purpose, or task; relating to the way in which something works or operates（有…）官能的, （有…）机能的, （有…）作用的, （有…）目的的, 与…工作方式有关的：
there are important functional differences between left and right brain.
左脑和右脑在机能上有重要的不同之处。
1.1
- designed to be practical and useful, rather than attractive为实用而设计的; 实用的：
she had assumed the flat would be functional and simple.
她曾想当然地认为公寓将是实用和简单的。
1.2
- working or operating在工作的; 在运转的：
the museum will be fully functional from the opening of the festival.
从这个庆祝活动开幕起, 该博物馆将全面投入使用。
1.3
- (of a disease) affecting the operation, rather than the structure, of an organ（疾病）官能的, 机能的：
functional diarrhoea.
官能性腹泻。
1.4
- (of a mental illness) having no discernible organic cause（精神病）找不出器质性原因的：
functional psychosis.
机能性精神病。
2
- Mathematics of or relating to a variable quantity whose value depends upon one or more other variables【数】函数的。
派生词
functionally
adverb就功能而言, 图书馆服务的作用无疑是教育性的。