noun, plural diaries.
a daily record, usually private, especially of the writer's own experiences, observations, feelings, attitudes, etc.
a book for keeping such a record.
a book or pad containing pages marked and arranged in calendar order, in which to note appointments and the like.

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

dairy, diary.

1, 2. journal, daybook, log, chronicle.
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World English Dictionary
diary (ˈdaɪərɪ)
n , pl -ries
1.  a personal record of daily events, appointments, observations, etc
2.  a book for keeping such a record
[C16: from Latin diārium daily allocation of food or money, journal, from diēs day]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1581, from L. diarium, "daily allowance," later "a journal," neut. of diarius "daily," from dies "day." Earliest sense was a daily record of events; sense of the book in which such are written is first attested in Ben Jonson's "Volpone" (1605).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He thought of writing an online diary of his own but concluded that his life
  was too boring.
Letter-writing and diary-keeping were unusual, especially for commoners.
Fay's diary includes stories of close encounters with animals, near-starvation,
  and disease.
Keeping a diary and trying to keep active was part of the plan.
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