diary

Etymology

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

noun

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.
   No, I’m just going over the stuff Tara wrote in my diary. She’s writing your diary? Could you be any lazier? Jan 30 2005, Jef Biederman, “Feng Shui Is Like So Passe”, in Totally Spies!: Undercover, season 3, episode 19, spoken by Alexandra “Alex” (Andrea Baker as Clover and Katie Griffin), Marathon Media, via Teletoon
2. (Britain, Canada) A personal organizer or appointment diary.
   It is recommended that teachers and pupils are issued with homework diaries to help implement and monitor the homework timetable. 2004, Victoria Kidwell, Homework, page 29

adj

1. (obsolete) Lasting for one day.
   the offer of a usurpation, though it were but as a diary ague 1605, Francis Bacon, a letter to the Lord Chancellor, touching the History of Britain

verb

1. (intransitive) To keep a diary or journal.
   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." 2015, Hugh O'Donovan, Mindful Walking