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The combination of all technical, administrative, and managerial actions intended to retain it in or restore it to a state in which it can reliably perform a required function. Maintenance can be planned or unplanned.

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Merriam-Webster Online Dictionary
maintenance (noun)
1.
the act of the state of being - maintaining maintained support
2.
something that - maintains
3.
the upkeep of property or equipment
4.
an officious or unlawful in a legal suit by assisting either party with means to carry it on - intermeddling
Merriam-Webster Online Thesaurus
maintenance (noun)
the act or activity of keeping something in an existing and usually satisfactory condition
SYNONYMS:
care and feeding, conservation, conserving, keep, preservation, preserving, sustentation, upkeep
RELATED WORDS:
conservancy; support, sustaining; care, custody, guardianship; defense, guarding, protection, safeguarding, safekeeping
NEAR ANTONYMS:
dereliction, disregard, ignoring, inattention, neglect, negligence; damage, demolition, destruction, harm, hurt, injury, ruin, ruination
Maintenance (Wikipedia)

The technical meaning of maintenance involves functional checks, servicing, repairing or replacing of necessary devices, equipment, machinery, building infrastructure and supporting utilities in industrial, business, and residential installations. Terms such as "predictive" or "planned" maintenance describe various cost-effective practices aimed at keeping equipment operational; these activities occur either before or after a potential failure.

A tractor being mechanically repaired in Werneuchen, 1966
Field repair of aircraft engine (1915–1916)
Maintenance (Wiktionary)

English

Etymology

From Middle English mayntenaunce, from Old French maintenance, from maintenir, from Latin manus tenēre (to hold in the hand). By surface analysis, maintain +‎ -ance.

Note that maintain has undergone a sound and spelling change, hence is spelt with -tain-, rather than the -ten- still found in maintenance.

Pronunciation

  • IPA(key): /ˈmeɪnt(ə)nəns/, /ˈmeɪntɪnəns/, [ˈmẽɪ̃(n)ʔ(ə)nəns]

Noun

maintenance

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Upkeep, preservation, care, servicing, management
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