Longman Dictionary of Contemporary English homepage

functional

adjective
     
func‧tion‧al
1 designed to be useful rather than beautiful or attractive [≠ decorative]:
buildings that are sensitively designed, not purely functional
2 something that is functional is working correctly [= 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.
functionally adverb

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