"to embody in an outward form; convey the quality of external reality upon," 1846, from external + -ize. Related: Externalized; externalizing.
Self-government begins with a reverential recognition of a supreme law: its process is a constant endeavor to render that law objective, real, operative—to externalize it, if we may use the term. [American Review, July, 1846]
language externalizes our thoughts
exterminator
extern
external
externality
externalization
externalize
extinct
extinction
extinguish
extinguishable
extinguisher