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a quo

[ah-kwoh; English ey-kwoh]
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Latin.
  1. from which; following from: used as a point of departure, as for an idea or plan.

terminus a quo

[ter-mi-noo s ah kwoh; English tur-muh-nuh s ey kwoh]
noun Latin.
  1. the end from which; beginning; starting point; earliest limiting point.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for a quo

terminus a quo

noun
  1. the starting point; beginning

Word Origin

literally: the end from which
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012