Entry 2 senses · 2 variants Webster, 1913 Quotidian /(kwō̇*tĭd"ĭ*an)/ · Quo·tid·i·an · IPA /kwoʊˈtɪdiən/ a. n. 01 a. Occurring or returning daily; as, a quotidian fever. 1. Occurring or returning daily; as, a quotidian fever. 02 n. Anything returning daily; especially (Med.), an intermittent fever or ague which returns every day. 1. Anything returning daily; especially (Med.), an intermittent fever or ague which returns every day.(Med.)