/lok"boks'/ , n.
1. a strongbox.
2. a rented post-office box equipped with a lock.
3. Also called lockout box . Television. a closed box, usually fitted with a lock, containing electronic equipment to unscramble cable television pictures for subscribers only: used esp. to prevent children from watching programs with explicit sexual content.
[ 1870-75, Amer.; LOCK 1 + BOX 1 ]