| defunct | (adjective) having ceased to exist or live | - |
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| (adjective) no longer in force or use; inactive | - |
| defunctness | (noun) no longer in existence | Synonyms: extinction |
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| disfunction | (noun) (medicine) any disturbance in the functioning of an organ or body part or a disturbance in the functioning of a social group | Synonyms: dysfunction |
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| dysfunction | (noun) (medicine) any disturbance in the functioning of an organ or body part or a disturbance in the functioning of a social group | Synonyms: disfunction |
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| dysfunctional | (adjective) impaired in function; especially of a bodily system or organ | - |
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| (adjective) (of a trait or condition) failing to serve an adjustive purpose | Synonyms: nonadaptive |
| dysfunctionality | (noun) The condition of functioning incorrectly or abnormally. | - |
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| function | (noun) the actions and activities assigned to or required or expected of a person or group | Synonyms: office, part, role |
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| (noun) what something is used for | Synonyms: purpose, role, use |
| (noun) a set sequence of steps, part of larger computer program | Synonyms: procedure, routine, subprogram, subroutine |
| (noun) a formal or official social gathering or ceremony of people | Synonyms: affair, occasion, social affair, social function, social gathering, social occasion |
| (noun) a formal or official social gathering or ceremony | - |
| (noun) (mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function) | Synonyms: map, mapping, mathematical function, single-valued function |
| (noun) a relation such that one thing is dependent on another | - |
| (verb) perform duties attached to a particular office or place or function | Synonyms: officiate |
| (verb) perform as expected when applied | Synonyms: go, operate, run, work |
| (verb) serve a purpose, role, or function | Synonyms: serve |
| 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 |
| functionalism | (noun) a psychology based on the assumption that all mental process are useful to an organism in adapting to the environment | - |
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| (noun) any doctrine that stresses utility or purpose | - |
| functionalist | (noun) an adherent of functionalism | - |
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| functionality | (noun) capable of serving a purpose well | - |
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| functionally | (adverb) with respect to function | - |
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| functionary | (noun) a worker who holds or is invested with an office | Synonyms: official |
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| functioning | (adjective) performing or able to perform its regular function | - |
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| (noun) process or manner of functioning or operating | Synonyms: operation, performance |
| malfunction | (noun) a failure to function normally | - |
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| (verb) fail to function or function improperly | Synonyms: misfunction |
| malfunctioning | (adjective) not performing or able to perform its regular function | Synonyms: nonfunctional |
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| misfunction | (verb) fail to function or function improperly | Synonyms: malfunction |
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| multifunctionality | (noun) The condition of having multiple functions. | - |
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| nonfunctional | (adjective) not having or performing a function | - |
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| (adjective) not performing or able to perform its regular function | Synonyms: malfunctioning |
| perfunctorily | (adverb) in a set manner without serious attention; as a formality | Synonyms: pro forma |
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| perfunctory | (adjective) hasty and without attention to detail; not thorough | Synonyms: casual, cursory, passing, superficial |
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| (adjective) done or produced as a formality only | Synonyms: pro forma |
| unfunctional | (adjective) not related to or suitable for everyday needs or activities | - |
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