terminusad quem

ter·mi·nus ad quem (tĕrʹmĭ-no͝os' äd kwĕmʹ, tûrʹmə-nəs ăd) n.

1. A goal or finishing point.

2. A final limiting point in time:

The date of the author's death was the only terminus ad quem for the manuscript.

  [Latin, limit to which.]

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