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Meaning of substantivize

sub•stan•tiv•ize

Pronunciation: (sub'stun-tu-vīz"), [key]
— -ized, -iz•ing.
  1. to use (an adjective, verb, etc.) as a substantive; convert into a substantive: a substantivized participle.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.