What is Probatory Term?

Legal Definition
In the British courts of admiralty, after the issue is formed between the parties, a time for taking the testimony is assigned, this is called a probatory term.

2. This term is common to both parties, and either party may examine his witnesses. When good cause is shown the term will be enlarged. 2 Bro. Civ. and Adm. Law, 418 Dunl. Pr. 217.
-- Bouviers Law Dictionary
Legal Definition
This name is given, in the practice of the English admiralty courts, to the space of time allowed for the taking of testimony in an action, after issue formed.
-- Black's Law Dictionary