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Adjective: day-by-day  'dey,bI'dey
  1. Of or belonging to or occurring every day
    "day-by-day routine";
    - daily, day-to-day, day-after-day
Adverb: day by day
  1. Gradually and progressively
    "his health weakened day by day";
    - daily

See also: periodic, periodical

Encyclopedia: Day by day