ir·rel·e·vant

[ih-rel-uh-vuhnt]
adjective
1.
not relevant; not applicable or pertinent: His lectures often stray to interesting but irrelevant subjects.
2.
Law. (of evidence) having no probative value upon any issue in the case.

Origin:
1780–90

ir·rel·e·vant·ly, adverb


The pronunciation of irrelevant [ih-rel-uh-vuhnt] as [ih-rev-uh-luhnt] as if spelled irrevelant, is the result of metathesis, the transposition of two sounds, in this case, the [l] and the [v] Relevant, the base word, is occasionally subject to the same process. Analogy with words like prevalent and equivalent may play a role. A similar reordering of the [l] and [v] consonant sounds, althought not a strict one-to-one metathesis, can be heard for Calvary [kal-vuh-ree] when pronounced [kav-uhl-ree]. Here the transposition is reinforced by the existence of the familiar word cavalry.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Irrelevant is a GRE word you need to know.
So is irrational. Does it mean:
to supply land with water by artificial means
not in accordance with reason; utterly illogical:
Collins
World English Dictionary
irrelevant (ɪˈrɛləvənt) [Click for IPA pronunciation guide]
 
adj
not relating or pertinent to the matter at hand; not important
 
ir'relevance
 
n
 
ir'relevancy
 
n
 
ir'relevantly
 
adv

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

irrelevant
1786, from ir- (see in-) + (see relevant).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The differences are so slight that the researchers suspect them to be
  functionally irrelevant.
Applications that piggyback on existing features are naturally at risk of
  becoming irrelevant, he says.
Your statement was totally irrelevant and should find some new sources for your
  information.
It's difficult to see how anyone can consider issues surrounding potentially
  fatal poisons as irrelevant to human health.
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