The physical dimensions, proportions, magnitude, or extent of an object. Any of a series of graduated categories of dimension whereby manufactured articles, such as shoes and clothing, are classified. Considerable extent, amount, or dimensions: a debt of enormous size. Relative amount or number, as of population or contents: What size is Cleveland? Character, value, or status with reference to relative importance or the capacity to meet given requirements: Try this proposal on for size. The actual state of affairs: That's about the size of the situation. To arrange, classify, or distribute according to size. To make, cut, or shape to a required size. Sized. Often used in combination: bite-size appetizers; an economy-size package. size up To make an estimate, opinion, or judgment of: She sized up her opponent. Any of several gelatinous or glutinous substances usually made from glue, wax, or clay and used as a glaze or filler for porous materials such as paper, cloth, or wall surfaces. To treat or coat with size or a similar substance.