a prefix, meaning “inwardly,” “within,” occurring in loanwords from Latin (introspection ); occasionally used in the formation of new words (introjection ).
Compare intra-.

< Latin, representing intrō (adv.) inwardly, within Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
in, into, or inward: introvert
[from Latin intrō towards the inside, inwardly, within]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

from L. intro "on the inside, within, to the inside."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

intro- pref.

  1. In; into: intromission.

  2. Inward: introspection.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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