Etymology
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contemporaneous (adj.)

"living or existing at the same time," 1650s, from Late Latin contemporaneus "contemporary," from the same Latin source as contemporary (adj.)but with an extended form after Late Latin temporaneous "timely." Related: Contemporaneously; contemporaneousness. An earlier adjective was contemporanean(1550s).

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Definitions of contemporaneous

contemporaneous (adj.)
occurring in the same period of time;
a rise in interest rates is often contemporaneous with an increase in inflation
Synonyms: contemporary
contemporaneous (adj.)
of the same period;
Synonyms: coetaneous / coeval
From wordnet.princeton.edu