(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.

(nautical) A block having a rope about it, and on an end hanging several feet from it.

(nautical) a thick, strong single block

(programming) A block of source code, often one that is delimited by brackets or in some similar way, depending on the programming language.

An electric heater that heats the engine of a car to ease starting in cold weather.

plural of clump block

A pictorial representation of a system or process in which subsystems or other components are represented by geometric shapes joined by lines or arrows

(computing) An image that contains the sectors read from an original floppy disk or optical disc.

(aviation) The time from the moment the aircraft door closes at departure of a revenue flight until the moment the aircraft door opens at the arrival gate following its landing. Block hours are the industry-standard measure of aircraft utilization.

A festive event held in the street of a city block / (basketball, slang) A game during which a single player blocks the shots of many other players