Origin: 1300–50; < Latinquotīdiānus, cottīdiānus daily, equivalent to cottīdi(ē) every day (adv.) (*quot(t)ī a locative form akin to quot however many occur, every + diē, ablative of diēs day; cf. meridian) + -ānus-an; replacing Middle Englishcotidien < Old French < Latin, as above