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.
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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
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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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Example sentences
Parts of the brain are constantly being co-opted to process technological innovations.
Rather they began as flappers whose beating wings co-opted motions that originally evolved to perform some other functions.
The complete corruption by the banker elite has completely co-opted our government, our system and our liberty.
In fact, he has co-opted the mathematics of exotic phase transitions to build his theory of gravity.
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