A more thorough explanation:

Definition: Affirmance day general is a term used in the Court of Exchequer to refer to a day appointed after the beginning of every term to affirm or reverse judgments.

Example: In the Court of Exchequer, after the beginning of every term, a day is appointed for affirming or reversing judgments. This day is called affirmance day general.

This example illustrates how affirmance day general is a specific day appointed for a particular purpose in the Court of Exchequer.