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diary (n.)

1580s, "an account of daily events, a journal kept by one person of his or her experiences and observations," from Latin diarium "daily allowance," later "a journal," neuter of diarius "daily," from dies "day" (from PIE root *dyeu- "to shine," in derivatives "sky, heaven, god"); also see -ary.

Sense of "a book with blank leaves or dated pages meant for keeping a daily record of events" is from c. 1600. Related: Diarial; diarian.

Origin and meaning of diary

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Definitions of diary from WordNet

diary (n.)
a daily written record of (usually personal) experiences and observations;
Synonyms: journal
diary (n.)
a personal journal (as a physical object);
From wordnet.princeton.edu