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From Latin diārium (a daily allowance for soldiers, in Late Latin also ‘diary’), neuter of *diarius, from diēs (a day). Cognate with Spanish diario (daily; diary).


  • IPA(key): /ˈdaɪəɹi/, /ˈdaɪɹi/
  • (file)
  • Rhymes: -aɪəri, -aɪɹi


diary (plural diaries)

  1. A daily log of experiences, especially those of the writer.
    They kept separate diaries. His was on paper and her diary was on her computer's hard drive.
    • 2005 January 30, Andrea Baker as Clover and Katie Griffin as Alexandra “Alex”, “Feng Shui Is Like So Passe”, in Totally Spies!: Undercover, season 3, episode 19, written by Jef Biederman, Teletoon, Marathon Media:
      No, I’m just going over the stuff Tara wrote in my diary.
      She’s writing your diary? Could you be any lazier?
  2. (Britain, Canada) A personal organizer or appointment diary.
    • 2004, Victoria Kidwell, Homework, page 29:
      It is recommended that teachers and pupils are issued with homework diaries to help implement and monitor the homework timetable.


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diary (not comparable)

  1. (obsolete) Lasting for one day.
    • (Can we date this quote by Francis Bacon and provide title, author's full name, and other details?)
      the offer of a usurpation, though it was but as a diary ague


diary (third-person singular simple present diaries, present participle diarying, simple past and past participle diaried)

  1. (intransitive) To keep a diary or journal.
    • 2015, Hugh O'Donovan, Mindful Walking
      As part of her mindful movement practise, diarying is important to Sarah. 'It gives me a chance to see what is going on, to reflect on my experience.'

Further readingEdit