shrinkage

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The process of shrinking.
• noun The amount or proportion by which something shrinks.
• noun A reduction in value; depreciation.
• noun The total weight loss sustained by livestock in shipment to a market.
• noun Loss of merchandise, especially through theft.

from The Century Dictionary.

• noun The contraction of a material to a smaller surface or bulk, whether by cooling after being heated, as a metal, or by drying, as timber or clay, or by wetting, as cord or fabrics.
• noun Figuratively, a similar reduction of any kind, as loss of weight; especially, loss of value: as, shrinkage in real estate.
• noun Amount of diminution of surface or bulk, weight or value: as, the shrinkage of cast-iron by cooling is one eighth of an inch to a foot; the shrinkage on the goods was 10 per cent.
• noun In gunnery, the difference between the outside diameter of the inner cylinder and the inside diameter of the outer cylinder of a built-up gun.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of shrinking; a contraction into less bulk or measurement.
• noun The amount of such contraction; the bulk or dimension lost by shrinking, as of grain, castings, etc.
• noun colloq. Decrease in value; depreciation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of shrinking, or the proportion by which something shrinks.
• noun The loss of merchandise through theft.
• noun slang The reduction in size of the male genitalia following immersion in cold water

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun process or result of becoming less or smaller
• noun the act of stealing goods that are on display in a store
• noun the amount by which something shrinks