1. (adverb)daily, day-to-day, day-by-day, day-after-day of or belonging to or occurring every day Synonyms: casual, everyday, daily, day-by-day, day-after-day, day-to-day Antonyms: nonperiodic, aperiodic
2. (adverb)day in day out, day after day for an indefinite number of successive days Synonyms: day in day out, day after day Antonyms: aperiodic, nonperiodic