[pruh-lawng, -long]

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

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

1. See lengthen.

Antonyms for prolong Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for prolonged

Contemporary Examples of prolonged

Historical Examples of prolonged

  • The reading of the letter was greeted with prolonged applause.

    The Grand Old Man

    Richard B. Cook

  • Each one of his words lulled and prolonged the reverie of Angelique.

    The Dream

    Emile Zola

  • The silence in the kitchen was prolonged, and Mr Verloc felt disappointed.

    The Secret Agent

    Joseph Conrad

  • Her prolonged immobility disturbed the comfort of his refection.

    The Secret Agent

    Joseph Conrad

  • Forthwith, he subjected the patient to a prolonged auscultation.

British Dictionary definitions for prolonged



(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 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