"one who believes that there is but one god," 1670s, from monotheism + -ist.
Entries linking to monotheist
monotheism n.
"doctrine or belief that there is but one god," 1650s, from mono- "single, alone" + -theism "belief (of a specified kind) in God, a god, or gods."
-ist
word-forming element meaning "one who does or makes," also used to indicate adherence to a certain doctrine or custom, from French -iste and directly from Latin -ista (source also of Spanish, Portuguese, Italian -ista), from Greek agent-noun ending -istes, which is from -is-, ending of the stem of verbs in -izein, + agential suffix -tes.
Variant -ister (as in chorister, barrister) is from Old French -istre, on false analogy of ministre. Variant -ista is from Spanish, popularized in American English 1970s by names of Latin-American revolutionary movements.
monotheistic adj.
"of or pertaining to monotheism; believing that there is but one god," 1805, from monotheist + -ic.