contemporaneous

If you're born on the same day as your friend, you've got a contemporaneous birthday, or one that happens in the same period of time.

Contemporaneous comes from the Latin prefix con- meaning "together with" and temporaneus, meaning "time." Two contemporaneous events happen together in time. Richard Nixon's presidency and the first man on the moon are contemporaneous — both happened at the same period of time in history.

Definitions of contemporaneous
1

adj occurring in the same period of time

“a rise in interest rates is often contemporaneous with an increase in inflation”
Synonyms:
contemporary
synchronal, synchronic, synchronous
occurring or existing at the same time or having the same period or phase

adj of the same period

Synonyms:
coetaneous, coeval
synchronal, synchronic, synchronous
occurring or existing at the same time or having the same period or phase

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