[ pruh-lawng, -long ]
See 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

First recorded in 1375–1425; late Middle English prolongen, from Late Latin prōlongāre “to lengthen,” equivalent to prō- “forward, forth” + long(us) “long” + -ā- theme vowel + -re infinitive ending; see pro-1, long1

synonym study For prolong

1. See lengthen.

Opposites for prolong

Other words from prolong

  • pro·long·a·ble, adjective
  • pro·long·a·ble·ness, noun
  • pro·long·a·bly, adverb
  • pro·long·er, noun
  • pro·long·ment, noun
  • un·pro·long·a·ble, adjective

Words Nearby prolong Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use prolong in a sentence

British Dictionary definitions for prolong


/ (prəˈlɒŋ) /

  1. (tr) to lengthen in duration or space; extend

Origin of prolong

C15: from Late Latin prōlongāre to extend, from Latin pro- 1 + longus long

Derived forms of prolong

  • prolongation (ˌprəʊlɒŋˈɡeɪʃən), noun
  • prolonger, noun
  • prolongment, noun

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