accumulation

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

• noun The act of gathering or amassing, as into a heap or pile.
• noun The process of growing into a large amount or heap.
• noun An amount that has accumulated or been accumulated.

from The Century Dictionary.

• noun The act of accumulating, or state of being accumulated; an amassing; a collecting together.
• noun Growth by continuous additions, as the addition of interest to principal.
• noun That which is accumulated; a heap, mass, or aggregation: as, a great accumulation of sand at the mouth of a river.

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

• noun The act of accumulating, the state of being accumulated, or that which is accumulated.
• noun (Law) The concurrence of several titles to the same proof.
• noun the storing of energy by means of weights lifted or masses put in motion; electricity stored.
• noun (Eng. Univ.) the taking of several together, or at smaller intervals than usual or than is allowed by the rules.

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

• noun The act of amassing or gathering, as into a pile.
• noun The process of growing into a heap or a large amount.
• noun A mass of something piled up or collected.
• noun law The concurrence of several titles to the same proof.
• noun accounting The continuous growth of capital by retention of interest or savings.
• noun finance The action of investors buying an asset from other investors when the price of the asset is low.

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

• noun an increase by natural growth or addition
• noun (finance) profits that are not paid out as dividends but are added to the capital base of the corporation
• noun several things grouped together or considered as a whole
• noun the act of accumulating