—n. 1. the spatial dimensions, proportions, magnitude, or bulk of anything: the size of a farm; the size of the fish you caught. 2. considerable or great magnitude: to seek size rather than quality. 3. one of a series of graduated measures for articles of manufacture or trade: children's sizes of shoes. 4. extent; amount; range: a fortune of great size. 5. actual condition, circumstance, or state of affairs: That's about the size of it. 6. a number of population or contents: What size is Springfield, Illinois? The size of that last shipment was only a dozen. 7. Obs.a fixed standard of quality or quantity, as for food or drink.
8. of a size, of the same or similar size: The two poodles are of a size. 9. try on for size, a. to put on briefly in order to test the fit of, as a garment or shoes.
b. to consider, evaluate, do, or use before taking further action: We'll try the plan on for size to see whether it's practical.
—v.t. 1. to separate or sort according to size.
2. to make of a certain size.
3. Metall.to press (a sintered compact) to close tolerances.
4. Obs.to regulate or control according to a fixed standard.
5. size up,Informal. a. to form an estimate of (a situation, person, etc.); judge: They sized him up with a look. b. to meet a certain standard: He doesn't size up to my expectations.