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Meaning of terminus a quo*

ter•mi•nus a quo

Pronunciation: (ter'mi-noos" ä kwō' Eng. tûr'm&schwa-n&schwas ā kwō'), [key]
— Latin. Latin.
  1. the end from which; beginning; starting point; earliest limiting point.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.