Meaning of "size" in Essential American English Dictionary

size

noun us /sɑɪz/

A2 how big or small something is:

It’s an area about the size of Florida.
The size of some of those trees is incredible.

A2 one of the different measurements in which things, for example clothes, food, etc. are made:

What size shoes do you take?

(Definition of “size” from the Webster's Essential Mini Dictionary © Cambridge University Press)