Definition of "boot camp"

(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).  examples

(chiefly Canada, US) A short, intensive, quasi-military program generally aimed at young offenders as an alternative to a jail term.  examples

(chiefly Canada, US, idiomatic) Any short, intensive course of training.  examples