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retention

[ri-ten-shuh n]
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noun
  1. the act of retaining.
  2. the state of being retained.
  3. the power to retain; capacity for retaining.
  4. the act or power of remembering things; memory.
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Origin of retention

1350–1400; Middle English retencion < Latin retentiōn- (stem of retentiō) a keeping back, equivalent to retent(us) (past participle of retinēre to retain) + -iōn- -ion
Related formsnon·re·ten·tion, nouno·ver·re·ten·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-retention

retention

noun
  1. the act of retaining or state of being retained
  2. the capacity to hold or retain liquid
  3. the capacity to remember
  4. pathol the abnormal holding within the body of urine, faeces, etc, that are normally excreted
  5. commerce a sum of money owed to a contractor but not paid for an agreed period as a safeguard against any faults found in the work carried out
  6. (plural) accounting profits earned by a company but not distributed as dividends; retained earnings
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Word Origin

C14: from Latin retentiō, from retinēre to retain
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for non-retention

retention

n.

late 14c., from Latin retentionem (nominative retentio) "a retaining, a holding back," noun of action from past participle stem of retinere (see retain). Originally medical; mental sense is from late 15c.

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Online Etymology Dictionary, © 2010 Douglas Harper

non-retention in Medicine

retention

(rĭ-tĕnshən)
n.
  1. Involuntary withholding by the body of wastes or secretions that are normally eliminated.
  2. The holding by the body of what normally belongs in it, such as food in the stomach.
  3. An ability to recall or recognize what has been learned or experienced; memory.
  4. In dentistry, a period following orthodontic treatment when a patient wears an appliance or appliances to stabilize the teeth in their new position.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.