noun

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