The Collaborative International Dictionary of English v.0.48:
day-to-day \day-to-day\ adj. occurring every day. Syn: daily, day-after-day. [WordNet 1.5]WordNet (r) 3.0 (2006):
day-to-day adj 1: of or belonging to or occurring every day; "daily routine"; "a daily paper" [syn: daily, day-to-day, day-by-day, day-after-day]