The act or process of disconnecting or detaching; separation. The state of being separate or detached. Indifference to or remoteness from the concerns of others; aloofness: preserved a chilly detachment in his relations with the family. Absence of prejudice or bias; disinterest: strove to maintain her professional detachment in the case. The dispatch of a military unit, such as troops or ships, from a larger body for a special duty or mission. The unit so dispatched. A permanent unit, usually smaller than a platoon, organized for special duties.