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coetaneous

[koh-i-tey-nee-uh s] /ˌkoʊ ɪˈteɪ ni əs/
adjective
1.
of the same age or duration.
Origin
1600-1610
1600-10; < Latin coaetāneus, equivalent to co- co- + aet(ās) age + -āneus compound adj. suffix; see -an, -eous
Related forms
coetaneously, adverb
coetaneity
[koh-i-tuh-nee-i-tee] /ˌkoʊ ɪ təˈni ɪ ti/ (Show IPA),
coetaneousness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for coetaneous

coetaneous

/ˌkəʊɪˈteɪnɪəs/
adjective
1.
(rare) of the same age or period
Derived Forms
coetaneously, adverb
coetaneousness, noun
Word Origin
C17: from Latin coaetāneus, from co- same + aetās age
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
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Word Origin and History for coetaneous
adj.

"having the same age," c.1600, from Late Latin coaetanus "one of the same age," from com- "with, together with" (see co-) + aetat- "age" + adjectival suffix -aneus.

Online Etymology Dictionary, © 2010 Douglas Harper
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