It's an odd piece of procedural technicality.

* Trump declared emergency Tariff powers.

* An appeal was made to stop this.

* The appeal has to be heard and voted on within X number of "Calendar days"

* "Calendar days" usually means "every day of the week, including weekends and holidays, as a 24-hour period from one midnight to the next."

* However this term has been "redefined in a context" such that it no longer means that ... (just with respect to the appeal against Trump's tariff powers)

with the result that the filed appeal will never be heard or voted on within the current session.

Programmers likely are familier with changing the meaning or type of things within a context .. it's a procedural version of that.