Originally: the quality of being ordinal. Later: the process of ranking things on an ordinal scale; (Economics) a system of measuring utility using rankings of preference.
ordinalism/ˈɔːdɪn(ə)lɪz(ə)m/ /ˈɔːdɪnəlɪz(ə)m/ /ˈɔːd(ə)nəlɪz(ə)m/
Mid 19th century; earliest use found in Robert Latham (1812–1888), ethnologist and philologist. From ordinal + -ism.