capable of being stacked, especially easily: stackable chairs.

1960–65; stack + -able

stackability, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stack (stæk)
1.  an ordered pile or heap
2.  a large orderly pile of hay, straw, etc, for storage in the open air
3.  (often plural) library science compactly spaced bookshelves, used to house collections of books in an area usually prohibited to library users
4.  a number of aircraft circling an airport at different altitudes, awaiting their signal to land
5.  a large amount: a stack of work
6.  military a pile of rifles or muskets in the shape of a cone
7.  (Brit) a measure of coal or wood equal to 108 cubic feet
8.  chimney stack See smokestack
9.  a vertical pipe, such as the funnel of a ship or the soil pipe attached to the side of a building
10.  a high column of rock, esp one isolated from the mainland by the erosive action of the sea
11.  an area in a computer memory for temporary storage
12.  to place in a stack; pile: to stack bricks on a lorry
13.  to load or fill up with piles of something: to stack a lorry with bricks
14.  to control (a number of aircraft waiting to land at an airport) so that each flies at a different altitude
15.  stack the cards to prearrange the order of a pack of cards secretly so that the deal will benefit someone
[C13: from Old Norse stakkr haystack, of Germanic origin; related to Russian stog]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Choose ones that are angular enough to be stackable but rounded enough that
  they won't poke holes in your liner.
Actually, it probably won't spend much time atop its base, as the two aren't
  stackable if anything is plugged in.
They recently proposed a new body bag concept that replaces bag for stackable
  plastic trays.
Excess baggage will be packable, stackable and safe in these molded,
  high-impact polypropylene storage containers.
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