The act of granting certain powers or the authority to carry out a particular task or duty. The authority so granted. The matter or task so authorized: Investigation of fraud was their commission. A document conferring such authorization. A public board or administrative body: The Federal Trade Commission investigates false advertising. often A ruling council within the Mafia that adjudicates family disputes and regulates family activities. The act of committing or perpetrating: the commission of a crime. A fee or percentage allowed to a sales representative or an agent for services rendered. An official document issued by a government, conferring on the recipient the rank of a commissioned officer in the armed forces. The rank and powers so conferred. To grant a military commission to. To grant authority for (something to be made or done); place an order for: commission a new symphony for the festival. To authorize or engage (someone to do something): commission an architect to design a building. See Synonyms at authorize. To put (a ship) into active service. In active service. Used of a ship. In use or in usable condition. Not in active service. Used of a ship. Not in use or working condition.