[pruh-lawng, -long]
See more synonyms for prolong on
verb (used with object)
  1. to lengthen out in time; extend the duration of; cause to continue longer: to prolong one's stay abroad.
  2. to make longer in spatial extent: to prolong a line.

Origin of prolong

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 formspro·long·a·ble, adjectivepro·long·a·ble·ness, nounpro·long·a·bly, adverbpro·long·er, nounpro·long·ment, nounun·pro·long·a·ble, adjectiveun·pro·longed, adjectivewell-pro·longed, adjective

Synonyms for prolong

See more synonyms for on
1. See lengthen.

Antonyms for prolong Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for prolong

Contemporary Examples of prolong

Historical Examples of prolong

  • He will prolong your life and loosen every button on your waistcoat.

    The Underdog

    F. Hopkinson Smith

  • Can they prolong their own possession, or lengthen his days who enjoys them?

  • Then which of us can prolong our lives by one day or hour or minute?

    The Christian

    Hall Caine

  • And then why—why should we prolong a painful interview, Glory?

    The Christian

    Hall Caine

  • It is not to treat him as a friend to prolong this interview.

British Dictionary definitions for prolong


  1. (tr) to lengthen in duration or space; extend
Derived Formsprolongation (ˌprəʊlɒŋˈɡeɪʃən), nounprolonger, nounprolongment, noun

Word Origin for prolong

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

Word Origin and History for prolong

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