Wordnet 3.0
NOUN (1)
1.
the doctrine that the application of a general term to various objects indicates the existence of a mental entity that mediates the application;
The Collaborative International Dictionary of English v.0.48:
Conceptualism \Con*cep"tu*al*ism\, n. (Metaph.)
A theory, intermediate between realism and nominalism, that
the mind has the power of forming for itself general
conceptions of individual or single objects. --Stewart.
[1913 Webster]
WordNet (r) 3.0 (2006):
conceptualism
n 1: the doctrine that the application of a general term to
various objects indicates the existence of a mental entity
that mediates the application