One who teaches the letters or elements of knowledge; a petty schoolmaster.
2.
A person devoted to the study of literary trifles, esp. trifles belonging to the literature of a former age. "That class of subjects which are interesting to the regular literator or black-letter " bibliomane," simply because they have once been interesting."
... scienterque possit aut dicere aut scribere, et poetas enarrare: idem literatus dicitur. Grammatista est qui barbaris literis obstrepit, cui abusus pro usu est; Graecis Latinam dat etymologiam, et totus in nugis est: Latine dicitur literator."—DESPAUTER. Synt., fol. 1. ... — The Grammar of English Grammars • Goold Brown