Medical Definition of externalize
externalized or British externalised; externalizing or British externalising
1a: to transform from a mental image into an apparently real object (as in hallucinations) : attribute (a mental image) to external causation <externalizing an obsession>b: to invent an explanation for (an inner problem whose actual basis is known only subconsciously) by attributing to causes outside the self : rationalize, project <externalized his failure>
2: to direct outward socially <externalized her anger>
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