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Douglas Harper's Etymology Dictionary
concretize

1884, from concrete + -ize. Concrete itself sometimes was used as a verb in various senses from 1630s.

Wiktionary
concretize

alt. (context transitive English) To make substantial, real, or tangible; to represent or embody a concept through a particular instance or example. vb. (context transitive English) To make substantial, real, or tangible; to represent or embody a concept through a particular instance or example.

WordNet
concretize
  1. v. make something concrete

  2. become specific; "the idea concretized in her mind" [syn: concretise]