Etymology - using the American Heritage College Dictionary
con·crete (konkret, kong-, kon´krét) adj 1. Of or relating to an actual, specific thing or instance; particular: concrete evidence. 2. Existing in reality or in real experience, perceptible by the senses; real: concrete objects. 3 . . . . [ME concret < Lat. concretus. p. part. of concrescere, to grow together, harden: com-, com- + crescere, to grow: see ker- in App.] - con·crete´ly adv. - con·crete´ness n.