Definitions of block
(also: block of flats; apartment block) a large building where many people live
More than 30 people were forced out of their homes in north London after the roof of a block of flats caught fire.
a period of time that is uninterrupted
I've a four-hour block on Friday when I can be free.
an amount of something, especially a number of separate things considered together as one single object
I'd like two blocks, please.