1
: a throwing in
especially
: a throwing of oneself into some pursuit or action
2
[International Scientific Vocabulary intro- + -jection (as in projection); originally formed as German introjektion]
: a theory that sense perceptions are mental counterparts of the objects perceived
3
[International Scientific Vocabulary intro- + -jection (as in projection); originally formed as German introjektion]
: the act or process of introjecting attitudes, ideas, or body parts
—opposed to projection
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Merriam-Webster unabridged
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