1. The cantoning or quartering of troops.
2. The place of lodging assigned to a section of a force when cantoned out; also (often in pl.) the place or places of encampment formed by troops for a more permanent stay in the course of a campaign, or while in winter quarters; ‘in India the permanent military stations are so termed’ (Stocqueler Mil. Encycl.).
3. transf. Quarters; places of occupation. (OED)
"After the attack on the Mehran base, people working on behalf of Hizb ut-Tahrir distributed leaflets at military bases and in cantonments in Karachi, with the aim of stirring up a revolt."
- Dexter Filkins, "The Journalist and the Spies: The murder of a reporter who exposed Pakistan's secrets", 19 September 2011 The New Yorker