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[pruh-lawng, -long] /prəˈlɔŋ, -ˈlɒŋ/
verb (used with object)
to lengthen out in time; extend the duration of; cause to continue longer:
to prolong one's stay abroad.
to make longer in spatial extent:
to prolong a line.
Origin of prolong
late Middle English
1375-1425; late Middle English prolongen < Late Latin prōlongāre to lengthen, equivalent to prō- pro-1 + long(us) long1 + -ā- theme vowel + -re infinitive ending
Related forms
prolongable, adjective
prolongableness, noun
prolongably, adverb
prolonger, noun
prolongment, noun
unprolongable, adjective
unprolonged, adjective
well-prolonged, adjective
1. See lengthen.
1. abbreviate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for prolonged
  • Call your health care provider if you have prolonged or severe flank pain, or if you suspect hydronephrosis.
  • At every table, plugs should be supplied to allow prolonged laptop use.
  • Staring at recession, policymakers in rich economies are considering how to avoid a prolonged slump.
  • In places where there have been prolonged heat exposures, there is probably a broad impact on many organ systems.
  • The meerkats reacted with a prolonged vigilance, paying much closer attention than they did to other recorded calls.
  • prolonged standing or walking can exhaust them, and even swallowing and breathing may be impaired.
  • prolonged proximity can itself be a source of conflict.
  • The prolonged crisis is draining belief in the euro and smothering the recovery.
  • The extent to which battery life would be prolonged of course varies depending on the situation.
  • prolonged exposure to freezing weather is more damaging than a brief plunge in temperature.
British Dictionary definitions for prolonged


(transitive) to lengthen in duration or space; extend
Derived Forms
prolongation (ˌprəʊlɒŋˈɡeɪʃən) noun
prolonger, noun
prolongment, noun
Word Origin
C15: from Late Latin prōlongāre to extend, from Latin pro-1 + longus long
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
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Word Origin and History for prolonged



early 15c., back-formation from prolongation or else from Old French prolonguer, porloignier (13c.), from Late Latin prolongare "to prolong, extend," from Latin pro- "forth" (see pro-) + longus "long" (adj.); see long (adj.). Related: Prolonged; prolonging; prolongable.

Online Etymology Dictionary, © 2010 Douglas Harper
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