pro·long

[pruh-lawng, -long]
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:
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

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
un·pro·longed, adjective
well-pro·longed, adjective


1. See lengthen.


1. abbreviate.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Prolong is a GRE word you need to know.
So is prominence. Does it mean:
the arch that separates a stage from the auditorium.
conspicuousness.
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World English Dictionary
prolong (prəˈlɒŋ) [Click for IPA pronunciation guide]
 
vb
(tr) to lengthen in duration or space; extend
 
[C15: from Late Latin prōlongāre to extend, from Latin pro-1 + longus long]
 
prolongation
 
n
 
pro'longer
 
n
 
pro'longment
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

prolong
1412, from O.Fr. prolonguer (13c.), from L.L. prolongare "to prolong, extend," from L. pro- "forth" + longus "long" (adj.) (see long (adj.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Stimuli that boost consumer spending prolong high levels of unemployment.
Bring indoors during winter to prolong the life of the birdhouse.
To mix the two up is simply to prolong the argument in a way that simply
  promotes paralysis.
Natural substances can treat cancer, prolong life and trigger amazing
  hallucinations.
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