Pronunciation: (ik-stûr'nl-īz"),[key] —v.t.,-ized, -iz•ing. 1. to make external; embody in an outward form.
2. to regard as consisting of externals.
3. to regard or treat as being caused by externals; attribute to external causes: to externalize one's difficulties. 4. to direct (the personality) outward in social relationships. Also,esp. Brit.,ex•ter'nal•ise".