noun

1. that quality of a thing which determines how much space it occupies; dimensions or magnitude of a thing
2. any of a series of graded classifications of measure into which merchandise is divided jumbo-size peanuts, size nine shoes
3. 1. extent, magnitude, amount, etc. an undertaking of great size
   2. relatively large amount, dimensions, etc.
4. character of a person with regard to ability to meet requirements
5. Informal actual condition; true state of affairs that's the size of it
6. Obsolete standard ration or allowance, as of food

Etymology: ME < OFr sise, aphetic for assise: see assize

transitive verb sized, sizing siz′·ing

1. to make of a certain size
2. to arrange or grade according to size