American Heritage Dictionary
(7)
Century Dictionary
(7)
GNU Webster's 1913
(1)
WordNet
(5)
Elsewhere on the web
Peterson parlayed cleavage, a quick wit, cleavage, campy humor, cleavage, and a slinky, black dress into her 15 minutes of fame.— Campanastan
The woman in the picture is loaded up with symbols and statements, and her cleavage is a mere phrase in a possibly very rich (or for all we know inane) conversation she is having with someone, maybe no one.— ScienceBlogs Channel : Life Science
In regards to one teacher, my teenage son described her this way-Her pants are so tight you see everything, we all know where her tramp stamps are and her cleavage is always showing.
Rocks also show distinct lines of cleavage, and are more readily split one way than another, the line of cleavage or stratum of break being at any angle and not necessarily parallel to its bed.— The Chemistry, Properties and Tests of Precious Stones
With a little crackling, the chlorate splits itself into many crystals along its chief lines of cleavage (called the cleavage planes), every one of which crystals showing under the microscope the identical form and characteristics of the larger crystal from which it came The cleavage of minerals must, therefore, be considered as a part of their crystalline structure, since this is caused by cleavage, so that both cleavage and crystalline structure should be considered together.— The Chemistry, Properties and Tests of Precious Stones

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a month.
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