It means “for this purpose”. It’s a temporary position created for a specific purpose. An Ad-hoc is specifically hired to argue a particular key point in which the person is expert.
Any document or a paper which is presented and allowed by the court in the hearing, trial or a plea as evidence, as distinguished from oral testimony.
If an adjournment is final, it is said that it is sine die, "without day" or a set period to resume the job.
“things to be done”.