Meaning of FUNCTIONAL in English

FUNCTIONAL

adj.1 of or serving a function.

2 (esp. of buildings) designed or intended to be practical rather than attractive; utilitarian.

3 Physiol. a (esp. of disease) of or affecting only the functions of an organ etc., not structural or organic. b (of mental disorder) having no discernible organic cause. c (of an organ) having a function, not functionless or rudimentary.

4 Math. of a function.

Phrases and idioms:

functional group Chem. a group of atoms that determine the reactions of a compound containing the group.

Derivatives:

functionality n. functionally adv.

Oxford English vocab.      Оксфордский английский словарь.