small cap is a noun meaning "a corporation with a small capitalization". It carries 2 recorded senses.
a corporation with a small capitalization
“this annual conference is a showcase for ambitious small caps”
a character having the form of an upper-case letter but the same height as lower-case letters
Definitions, synonyms and semantic relations for small cap come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.