WordReference Random House Learner's Dictionary of American English © 2019
main•tain /meɪnˈteɪn/USA pronunciation   v. 
  1. to keep in existence; preserve:[+ object]maintained their friendship for over forty years.
  2. to keep in a certain condition, operation, or force:[+ object]to maintain an even temperature.
  3. to state or declare:[+ (that) clause]maintained that he had been home all night.
  4. to support in argument:[+ object]maintained her innocence in spite of the evidence.
  5. to provide for the upkeep or support of:[+ object]Is that salary enough to maintain a family?
main•tain•a•ble, adj. 
main•te•nance /ˈmeɪntənəns/USA pronunciation  n. [uncountable]See -tain-, -man-1.

WordReference Random House Unabridged Dictionary of American English © 2019
main•tain  (mān tān),USA pronunciation v.t. 
  1. to keep in existence or continuance;
    retain:to maintain good relations with neighboring countries.
  2. to keep in an appropriate condition, operation, or force;
    keep unimpaired:to maintain order; to maintain public highways.
  3. to keep in a specified state, position, etc.:to maintain a correct posture; to maintain good health.
  4. to affirm;
    declare:He maintained that the country was going downhill.
  5. to support in speech or argument, as a statement or proposition.
  6. to keep or hold against attack:to maintain one's ground.
  7. to provide for the upkeep or support of;
    carry the expenses of:to maintain a family.
  8. to sustain or support:not enough water to maintain life.
main•taina•ble, adj. 
main•tain′a•bili•ty, n. 
main•tainer, n. 
  • Old French maintenir Medieval Latin manūtenēre, Latin manū tenēre literally, to hold in hand, equivalent. to manū, ablative of manus hand (see manual) + tenēre to hold (see tenet)
  • Middle English mainteinen 1200–50
    • 1.See corresponding entry in Unabridged continue.
    • 1, 2.See corresponding entry in Unabridged keep up.
    • 4.See corresponding entry in Unabridged asseverate.
      Maintain, assert, aver, allege, hold, state all mean to express an opinion, judgment, or position.
      Maintain carries the implications of both firmness and persistence in declaring or supporting a conviction:She maintained her client's innocence even in the face of damaging evidence.Assert suggests assurance, confidence, and sometimes aggressiveness in the effort to persuade others to agree with or accept one's position:He asserted again and again the government's right to control the waterway.Aver, like
      assert, implies confident declaration and sometimes suggests a firmly positive or peremptory tone;
      in legal use
      aver means "to allege as fact'':to aver that the evidence is incontrovertible.Allege indicates a statement without evidence to support it, and thus can imply doubt as to the validity or accuracy of an assertion:The official is alleged to have been unaware of the crime.Hold means simply to have or express a conviction or belief:We hold these truths to be self-evident; She held that her rights had been violated.State usually suggests a declaration that is forthright and unambiguous:He stated his reasons in clear, simple language.
    • 5.See corresponding entry in Unabridged uphold, defend, vindicate, justify.
    • 7.See corresponding entry in Unabridged See  support. 
    • 1.See corresponding entry in Unabridged discontinue.
    • 5.See corresponding entry in Unabridged contradict.

Collins Concise English Dictionary © HarperCollins Publishers::

maintain /meɪnˈteɪn/ vb (transitive)
  1. to continue or retain; keep in existence
  2. to keep in proper or good condition
  3. to support a style of living: the money maintained us for a month
  4. (takes a clause as object) to state or assert: he maintained that Talbot was wrong
  5. to defend against contradiction; uphold: she maintained her innocence
  6. to defend against physical attack
Etymology: 13th Century: from Old French maintenir, ultimately from Latin manū tenēre to hold in the hand

mainˈtainable adj mainˈtainer n

'maintain' also found in these entries:
Collocations: maintain a [friendship, relationship], maintain a [close, cordial, intimate] relationship, maintain your [car, house], more...

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