A Detachment

1. (uncountable) The action of detaching; separation.
2. (uncountable) The state of being detached or disconnected; insulation.
3. (uncountable) Indifference to the concerns of others; disregard; nonchalance; aloofness.
4. (uncountable) Absence of bias; impartiality; objectivity.
5. (uncountable, military) The separation of a military unit from the main body for a particular purpose or special mission.
6. (countable, military) The unit so dispatched.
7. (countable, military) A permanent unit organized for special duties.
8. (countable) Any smaller portion of a main body separately employed.