quo·tid·i·an / kwōˈtidēən/ • adj. of or occurring every day; daily: the car sped noisily off through the quotidian traffic. ∎  ordinary or everyday, esp. when mundane: his story is an achingly human one, mired in quotidian details. ∎  Med. denoting the malignant form of malaria.

quotidian daily, spec. of a fever recurring every day. XIV. ME. cotidien, -ian, quot-, orig. — OF. cotidien (mod. quotidien); early assim. to L. quotīdiānus, earlier cott-, cōtīdīanus, f. cott-, cōtīdiē (quot-) every day, f. base of quotus (see QUOTA) + diēs day; see -IAN.

quotidian (kwoh-tid-iăn) adj. occurring daily, as in the case of some intermittent fevers.