| functional | (adjective) designed for or capable of a particular function or use | - |
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| (adjective) involving or affecting function rather than physiology | - |
| (adjective) relating to or based on function especially as opposed to structure | - |
| (adjective) (of e.g. a machine) performing or capable of performing | Synonyms: operative, running, working |
| (adjective) designed for or adapted to a function or use | - |
| (adjective) fit or ready for use or service | Synonyms: operable, operational, usable, useable |
| functioning | (adjective) performing or able to perform its regular function | - |
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