(chiefly Canada, US, colloquial) Initial, basic indoctrination, physical fitness training and basic instruction in service-related subjects for new recruits in the armed forces (army, Air Force, navy and Marine Corps).

(computing) A small program that initiates the bootstrap process by loading the operating system proper.

A boot made of sheepskin with the wool as the lining and the leather as the outside.

(nautical) The process of cleaning the upper part of a ship's underwater hull and daubing it with a protecting layer of antifouling substance.

(rare in the singular) One of a pair of Wellington boots.

Alternative spelling of boottree

(computing) A dedicated block usually at the beginning (first block on first track) of a storage medium that holds special data used to start a system. Some systems use a boot block of several physical sectors, while some use only one boot sector. Other manufacturers use the terms boot block and boot sector interchangeably.

(computing) A dedicated sector, usually at the beginning (first sector on first track) of a storage medium, that holds special data used to start a system.

(US) a wheel clamp or Denver boot / (Australia, New Zealand, Britain) the boot (trunk) of a car / (Britain) a car boot sale

(Canada, US) A device locked into place over the wheel of a road vehicle, immobilizing it.