Meaning of FUNCTIONAL in English

FUNCTIONAL

■ adjective

1》 relating to or having a function: a ~ role.

↘relating to the way in which something functions: there are ~ differences between the left and right brain.

2》 designed to be practical and useful, rather than attractive.

3》 working or operating.

4》 (of a disease) affecting the operation rather than the structure of an organ.

5》 (of a mental illness) having no discernible organic cause.

Derivatives

~ly adverb

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.