an·​te·​me·​rid·​i·​an | \ ¦antēmə¦ridēən, -tə̇-\

Definition of antemeridian

: occurring before noon : of or relating to the forenoon antemeridian chores at 9 o'clock — compare ante meridiem

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First Known Use of antemeridian

circa 1656, in the meaning defined above

History and Etymology for antemeridian

Latin antemeridianus, from ante- + meridianus of noon

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The first known use of antemeridian was circa 1656

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