verb (used with object), invoked, invoking.
to call for with earnest desire; make supplication or pray for: to invoke God's mercy.
to call on (a deity, Muse, etc.), as in prayer or supplication.
to declare to be binding or in effect: to invoke the law; to invoke a veto.
to appeal to, as for confirmation.
to petition or call on for help or aid.
to call forth or upon (a spirit) by incantation.
to cause, call forth, or bring about.

1480–90; < Latin invocāre, equivalent to in- in-2 + vocāre to call, akin to vōx voice

invocable, adjective
invoker, noun
reinvoke, verb (used with object), reinvoked, reinvoking.
uninvocable, adjective
uninvoked, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To invoke
World English Dictionary
invoke (ɪnˈvəʊk)
1.  to call upon (an agent, esp God or another deity) for help, inspiration, etc
2.  to put (a law, penalty, etc) into use: the union invoked the dispute procedure
3.  to appeal to (an outside agent or authority) for confirmation, corroboration, etc
4.  to implore or beg (help, etc)
5.  to summon (a spirit, demon, etc); conjure up
[C15: from Latin invocāre to call upon, appeal to, from vocāre to call]
usage  Invoke is sometimes wrongly used where evoke is meant: this proposal evoked (not invoked) a strong reaction

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

1490, from M.Fr. envoquer (12c.), from L. invocare "call upon, implore," from in- "upon" + vocare "to call," related to vox (gen. vocis) "voice" (see voice).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Let both sides seek to invoke the wonders of science instead of its terrors.
Unlike too many of those who in modern time invoke their authority, they had a
  choice between the two.
And once you invoke it, there's no way to quit out of it, short of rebooting
  your computer.
Electronic objects intended for superdistribution invoke this hardware, which
  provides instructions.
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