verb (used with object)
to choose or take as one's own; make one's own by selection or assent: to adopt a nickname.
to take and rear (the child of other parents) as one's own child, specifically by a formal legal act.
to take or receive into any kind of new relationship: to adopt a person as a protégé.
to select as a basic or required textbook or series of textbooks in a course.
to vote to accept: The House adopted the report.
to accept or act in accordance with (a plan, principle, etc.).
Verb phrases
adopt out, to place (a child) for adoption: The institution may keep a child or adopt it out.

1490–1500; (< Middle French adopter) < Latin adoptāre, equivalent to ad- ad- + optāre to opt

adopter, noun
nonadopter, noun
preadopt, verb (used with object)
quasi-adopt, verb (used with object)
quasi-adopted, adjective
readopt, verb (used with object)
unadopted, adjective
well-adopted, adjective

1. adapt, adept, adopt ; 2. adopted, adoptive. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adopt (əˈdɒpt)
1.  law to bring (a person) into a specific relationship, esp to take (another's child) as one's own child
2.  to choose and follow (a plan, technique, etc)
3.  to take over (an idea, etc) as if it were one's own
4.  to take on; assume: to adopt a title
5.  to accept (a report, etc)
[C16: from Latin adoptāre to choose for oneself, from 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

1540s, from Fr. adopter (14c.), from L. adoptare "choose for oneself" (esp. a child); see adoption. Or perhaps a back-formation from Eng. adoption. Originally in Eng. also of friends, fathers, citizens, etc. Sense of "to legally take as one's own child" and that of "to
embrace, espouse" a practice, method, etc. are from c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Look around at what the other countries have done to manage agents and adopt
  these sound practices.
As open source begins to look more corporate, corporations themselves are
  looking to adopt and adapt more open-source practices.
Children adopt their parents' eating habits, so it looks hereditary.
Caregivers routinely adopt flying fox orphans and find them delightfully smart.
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