CONCRETE (concresco, to grow together), is opposed to
A concrete notion is the notion of an object as it exists in nature, invested
with all its qualities. An abstract notion, on the contrary, is the notion of
some quality or attribute deprived of all the specialities with which experience
invests it, or separated from the object to which it belongs, or from other
attributes with which in actuality it is always associated.— V. ABSTRACT, TERM.