terminus a quo

noun
\ -ˌä-ˈkwō \

Definition of terminus a quo 

1 : a point of origin

2 : a first limiting point in time

First Known Use of terminus a quo

1549, in the meaning defined at sense 1

History and Etymology for terminus a quo

New Latin, literally, limit from which

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The first known use of terminus a quo was in 1549

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