Meaning of FUNCTIONAL in English
func ‧ tion ‧ al AC /ˈfʌŋkʃ ə nəl/ BrE AmE adjective
[ Word Family: noun : ↑ function , ↑ functionality ; verb : ↑ function ; adverb : ↑ functionally ; adjective : ↑ functional ]
1 . designed to be useful rather than beautiful or attractive OPP decorative :
buildings that are sensitively designed, not purely functional
2 . something that is functional is working correctly SYN operational :
By 2004, the Supertram is expected to be fully functional.
3 . relating to the purpose of something:
The two departments have slight functional differences.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012