(historical) The main tower of a castle or fortress, located within the castle walls. (According to Wikipedia:keep, the word comes "from the Middle English term kype, meaning basket or cask, and was a term applied to the shell keep at Guînes, said to resemble a barrel".)
The food or money required to keep someone alive and healthy; one's support, maintenance.
The act or office of keeping; custody; guard; care; heed; charge.
The state of being kept; hence, the resulting condition; case.
(obsolete) That which is kept in charge; a charge.
(engineering) A cap for holding something, such as a journal box, in place.
