terminus a quoter·mi·nus a quo
a starting point; point of origin; beginning
Origin of terminus a quoL, end from which
terminus a quo
- A starting point or origin.
- A first point in time: The terminus a quo for the Middle Ages is often considered the fall of Rome in 476.
Origin of terminus a quoLatin terminus ā quō limit from which
- The lower limit of dating, as of the earliest plausible date at which a fact could have occurred or a document could have been written.