Any view which emphasizes concepts when analyzing something.
Primarily, conceptualism is a view about universals (things normally denoted in English by words ending in '-hood', '-ness', or '-ty').
It says that these are concepts in the mind (though not necessarily confined to an individual mind), and neither non-material objects with a real existence independent of any mind (as realists hold) nor mere words (as nominalists hold).
In connection with IDENTITY, conceptualism says a governing concept is always involved:
A cannot just be the same thing as B; it must always be the same so-and-so as B.
H Stamland, Universals (1972)