cardinal numeral UK /ˈkɑːdɪnəl ˈnjuːməɹəl/US /ˈkɑɹdɪnəl ˈnumɜɹəl/ noun1 •A word used to represent a cardinal number.Cardinal Numerals, are those which express the Number of things, as One, Two, Three, Four; [...] — 1706 formscardinal numerals