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diary

[dahy-uh-ree]
noun, plural di·a·ries.
  1. a daily record, usually private, especially of the writer's own experiences, observations, feelings, attitudes, etc.
  2. a book for keeping such a record.
  3. a book or pad containing pages marked and arranged in calendar order, in which to note appointments and the like.
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Origin of diary

1575–85; < Latin diārium daily allowance, journal, equivalent to di(ēs) day + -ārium -ary
Can be confuseddairy diary

Synonyms

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for diary's

diary

noun plural -ries
  1. a personal record of daily events, appointments, observations, etc
  2. a book for keeping such a record
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Word Origin

C16: from Latin diārium daily allocation of food or money, journal, from diēs day
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for diary's

diary

n.

1580s, from Latin diarium "daily allowance," later "a journal," neuter of diarius "daily," from dies "day" (see diurnal); also see -ary. Earliest sense was a daily record of events; sense of the book in which such are written is said to be first attested in Ben Jonson's "Volpone" (1605).

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Online Etymology Dictionary, © 2010 Douglas Harper