Meaning of FUNCTIONAL in English
/ ˈfʌŋkʃənl; NAmE / adjective
practical and useful; with little or no decoration
SYN utilitarian :
Bathrooms don't have to be purely functional.
The office was large and functional rather than welcoming.
having a special purpose; making it possible for sb to do sth or for sth to happen :
a functional disorder (= an illness caused when an organ of the body fails to perform its function)
a functional approach to language learning
These units played a key functional role in the military operation.
( especially of a machine, an organization or a system ) working; able to work :
The hospital will soon be fully functional.
► func·tion·al·ly / -ʃənəli; NAmE / adverb
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005