Etymology
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indoctrinate (v.)

formerly also endoctrinate, 1620s, "to teach," formed as if from Latin (but there seems to have been no word *indoctrinare), perhaps modeled on French endoctriner or extended from earlier (now obsolete) verb indoctrine, endoctrine, "to instruct" (mid-15c.); see in- (2) "in" + doctrine + -ate (2)). Meaning "to imbue with an idea or opinion" first recorded 1832. Related: Indoctrinated; indoctrinating.

updated on November 14, 2015

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Definitions of indoctrinate from WordNet

indoctrinate (v.)
teach doctrines to; teach uncritically;
The Moonies indoctrinate their disciples
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.