return day n: a day when a return is to be made: as
a: a day on which the defendant in an action or proceeding is to appear in court (as for arraignment)
b: a day on which the defendant in an action must file an answer
c: a day on which a hearing on an action or proceeding (as a motion) is to be held
d: a day on which proof of service must be returned
e: a day fixed by law for the canvassing of election returns – called also return date;
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.