Believer in; advocate of: utilitarian.
[Latin -ārius, -ary + -an.]
suffix forming nouns
indicating a person or thing that advocates, believes, or is associated with something: vegetarian; millenarian; librarian.
[from Latin -ārius -ary + -an]
Ar•i•an(ˈɛər i ən, ˈær-)
1. of or pertaining to Arius or Arianism.n.
2. an adherent of Arianism.
[1525–35; < Late Latin]
a suffix forming personal nouns corresponding to Latin adjectives ending in -ārius or English adjectives or nouns ending in -ary (librarian; proletarian); subsequently productive in English with other Latinate stems, forming nouns denoting a person who supports, advocates, or practices a doctrine, theory, etc., associated with the base word: authoritarian; vegetarian.