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
v. make something concrete
become specific; "the idea concretized in her mind" [syn: concretise]