verb (used without object)
to make a choice; choose (usually followed by for ).
Verb phrases
opt out, to decide to leave or withdraw: to opt out of the urban rat race and move to the countryside.

1875–80; < French opter to choose, divide < Latin optāre to wish for, desire, pray for, choose, select

unopted, adjective

1. select, pick, elect, prefer.
Dictionary.com Unabridged
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
opt (ɒpt)
vb (when intr, foll by for)
See also opt in See also opt out to show preference (for) or choose (to do something)
[C19: from French opter, from Latin optāre to choose]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1877, from Fr. opter "to choose," from L. optare "choose, desire" (see option). To opt out is attested from 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
  1. optative

  2. optical

  3. optional

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
If you choose to opt in, information about all your purchases is made available to your friends.
Imagine if every company you had never done business with required you to opt
  out of their junk mailings.
When climbers opt to climb without a rope, they lose the luxury of learning
  from mistakes.
Others tend to see more similarities between fossils and opt for trees with
  fewer offshoots.
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