1. To ask for urgently: The mayor demanded that the police conduct an investigation into the murder of the child as soon as possible

Theodore demanded to speak to the manager about the poor quality of the product that he had recently purchased.

2. To claim as just or due: The bank is demanding repayment of Joe's loan.

3. To ask to be informed of: The teacher was demanding to know why the students thought her comments were so funny.
4. To require as useful, just, proper, or necessary; to call for: Jill was told that the jewelry she was considering to buy had a gem that demanded a fine setting in the necklace.
5. In law: To summon to court; to claim formally; lay legal claim to: During the court proceedings documents were demanded by the prosecutor for further proof of the case.