Meaning of “block” - Learner’s Dictionary

block

noun [ C ] uk us /blɒk/
PIECE

B2 a solid piece of something, usually in the shape of a square or rectangle:

a block of ice/stone/wood
DISTANCE US

B1 the distance along a street from where one road crosses it to the place where the next road crosses it:

They only live two blocks away from the school.
BUILDING mainly UK

B1 a large building containing many apartments or offices:

UK a block of flats
GROUP OF BUILDINGS

a square group of buildings or houses with roads on each side:

Omar took the dog for a walk round the block.
CANNOT THINK

If you have a block about something, you cannot understand it or remember it:

I had a complete mental block about his name.
STOP PROGRESS

something that makes it difficult to move or make progress

AMOUNT

an amount or group of something that is considered together:

This block of seats is reserved.
→ See also be a chip off the old block , stumbling block , tower block

(Definition of “block noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)