• WordNet 3.6
    • n cleavage the act of cleaving or splitting
    • n cleavage the line formed by a groove between two parts (especially the separation between a woman's breasts)
    • n cleavage (embryology) the repeated division of a fertilised ovum
    • n cleavage the breaking of a chemical bond in a molecule resulting in smaller molecules
    • n cleavage the state of being split or cleft "there was a cleavage between the liberal and conservative members"
    • ***
Webster's Revised Unabridged Dictionary
    • Cleavage (Geol) Division into laminæ, like slate, with the lamination not necessarily parallel to the plane of deposition; -- usually produced by pressure.
    • Cleavage The act of cleaving or splitting.
    • Cleavage (Crystallog) The quality possessed by many crystallized substances of splitting readily in one or more definite directions, in which the cohesive attraction is a minimum, affording more or less smooth surfaces; the direction of the dividing plane; a fragment obtained by cleaving, as of a diamond. See Parting.
    • ***
Century Dictionary and Cyclopedia
    • n cleavage The act of cleaving or splitting, or the state of being cloven.
    • n cleavage In mineralogy, the property possessed by many crystallized minerals of breaking readily in one or more directions, by which means surfaces more or less smooth are obtained. The cleavage shows the direction in which the force of cohesion is least. (Compare parting.) It is defined as perfect or eminent, imperfect, interrupted, etc., according to the ease with which the fracture takes place, and the smoothness of the resulting surface; also cubic, octahedral, rhombohedral, prismatic, basal, etc., according to the direction of the fracture.
    • n cleavage In geology, the property possessed by certain rocks of being easily split or divided into thin layers. It is chiefly the argillaceous rocks in which cleavage is highly developed, and it seems to be the result of metamorphism combined with pressure. The cleavage of rooflng-slate is the best illustration of this structure.
    • n cleavage In embryology, segmentation, specifically of the vitellus: distinctively called egg-cleavage or yolk-cleavage. See segmentation.
    • ***
Chambers's Twentieth Century Dictionary
    • ns Cleavage a condition of rocks in which they split easily into thin plates
    • ***


  • Charles Baudelaire
    “The more a man cultivates the arts the less he fornicates. A more and more apparent cleavage occurs between the spirit and the brute.”


Chambers's Twentieth Century Dictionary
A.S. cleófan; cog. with Ger. klieben.


In literature:

There were no catches or hinges, or even any line of cleavage around the edge.
"Instant of Decision" by Gordon Randall Garrett
The cleavage between the two tendencies of the Republican Party became more marked.
"A History of the Third French Republic" by C. H. C. Wright
The blocks were quarried by cleavage; a groove was run along the line intended, and about 2 ft. apart holes about 4 in.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1" by Various
There was to be no hyphen, no cleavage between racial stocks, no line between sections or social classes.
"American World Policies" by Walter E. Weyl
The planes of cleavage, therefore, are distinguishable from those of stratification.
"Principles of Geology" by Charles Lyell
If we examine the outcrop of a coal bed we will find that these lines of cleavage are horizontal.
"Nature's Miracles, Volume 1" by Elisha Gray
The angle between the perfect rhombohedral cleavages is 73 deg.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2" by Various
There was a cleavage, not so much on lines of race, as on those of politics and religion.
"A Historical Geography of the British Colonies" by Charles Prestwood Lucas
For liquid oils 23 degrees C. is the proper heat as under 20 degrees C. the cleavage takes place slowly.
"Soap-Making Manual" by E. G. Thomssen
The cubic cleavage, which is so prominent a feature in galena, is here present only in traces.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 5" by Various
But we cannot regard the cleavage of the tree as the same in character as the cleavage of the hayrick.
"The Glaciers of the Alps" by John Tyndall
Trim bottom, nice little twist in her stride, just enough cleavage to make you wonder.
"The Samurai Strategy" by Thomas Hoover
In some cases where the strata are curved, the planes of cleavage are still perfectly parallel.
"A Manual of Elementary Geology" by Charles Lyell
To prevent this cleavage, urban and rural development should advance with equal steps.
"The African Colony" by John Buchan
Can we imagine two sides so close together that no plane of cleavage could pass between them?
"Through Nature to God" by John Fiske
In this state of mental cleavage, the student now formed an amazing resolve.
"Romain Rolland" by Stefan Zweig
Some of the cleavage stages.
"A Guide for the Study of Animals" by Worrallo Whitney
The first change the zygote undergoes in all animals is what is generally called the segmentation or cleavage of the ovum.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3" by Various
Most usually the 'cleavage,' as this fissile structure is termed, crosses the bedding at all angles.
"Geology" by James Geikie
Here true basalt is disclosed in all the grandeur of its columnar cleavage, but no other species of rock.
"The Highlands of Ethiopia" by William Cornwallis Harris

In news:

The singer and actress swapped one cleavage -bearing gown for another after the Academy Awards last night 2012 OSCARS: BEST AND WORST OF THE RED CARPET.
A lot of people are really hating on the outfit Christina Aguilera chose to wear when she sang At Last at Etta James' funeral, saying showing that much cleavage at a funeral is disrespectul.
How To Win a Talent Show: Drugs and Cleavage .
Several young hopefuls rushed forward to ply the judges with last-minute beer, bongs, and cleavage .
Dealing with his teenager's cleavage .
PETA's ' Cleavage Cavaliers' rally to Help Cleveland 'Beat The Heat'.
Cleavage & the Clinton Campaign Chest.
Put your cleavage away, ladies.
They keep the "girls" in place, they look pretty when you buy the right one, and they can make a woman feel confident simply by adding cleavage.
Dancer's clothes will cover men's chests, women's cleavage.
She finds low-cut tops and lower-cut jeans revealing rear cleavage or "whale tail" much more distracting .
A woman flying from Las Vegas on Southwest this spring says she was confronted by an airline employee for showing too much cleavage.
Rihanna can always be relied on to tweet something interesting, like pics of her own cleavage or her makeup-free face.
She may have considered herself a champion of female power, but the currency of that power was cleavage and legs, and women paid it by being complicit in their own objectification.
Can you flaunt too much cleavage.

In science:

Including crystalline anisotropy would lead us to the physics of cleavage along the crystalline planes.
Formal Considerations about Fracture: Nucleation and Growth
Given a map ∆i,j (Γα) and the map relative to 7That is, the cleavage into the original aminoacids of misfolded proteins.
Simple models of protein folding and of non--conventional drug design
Unfortunately, this material is complicated by the presence of CuO-chain layers and does not have a neutral [001] cleavage plane for surface-sensitive techniques.
Tl2Ba2CuO6+d Brings Spectroscopic Probes Deep Into the Overdoped Regime of the High-Tc Cuprates
The ratio RF pg /Rpip of the number of radioactively labeled fragments of length ℓ produced by Fpg cleavage or by piperidine cleavage indicates the probability of closing for this particular guanine.
Experimental and theoretical studies of sequence effects on the fluctuation and melting of short DNA molecules
In 2009, the structures of the products and their formation pathways were investigated using deuterium-labeling experiments, indicating the initial photochemical cleavages of C-H and N-H bonds, for glycine [121].
Recent Progress in Chirality Research Using Circularly Polarized Light
Since the ‘space of cleavages’ of a fibered category is in some sense contractible, it is mostly a matter of taste which language to use (see discussion in last paragraph of §3.1.3 in [Vi]).
Supersymmetric field theories and generalized cohomology
This behaviour is typical to a homolitic bond cleavage.
Quantum Optimal Control Theory of Harmonic Generation
This rule for crack growth only takes into account crack growth through cleavage and completely ignores bending terms.
New model for crack growth using random walkers
Cleavage usually occurs in the middle of bilayers.
Amphiphilic Membranes
As a speci fic example, when Tryps in is used as the digesting enzyme, RAId DbS allows for incorrect N-terminal cleavages.
RAId DbS: A Mass-Spectrometry Based Peptide Identification Web Server with Knowledge Integration
RAId DbS has internal counters, Cc and Cinc , counting respectively the number of scored peptides with correct and incorrect N-terminal cleavage.
RAId DbS: A Mass-Spectrometry Based Peptide Identification Web Server with Knowledge Integration
When calculating the E -value of a peptide with correct Nterminal cleavage, RAId DbS multiplies the peptide’s P -value by Cc .
RAId DbS: A Mass-Spectrometry Based Peptide Identification Web Server with Knowledge Integration
However, the E -value of a peptide with incorrect N-terminal cleavage will be obtained by multiplying the peptide’s P -value by Cc + Cinc (Alves et al., 2007a).
RAId DbS: A Mass-Spectrometry Based Peptide Identification Web Server with Knowledge Integration
Focusing on Change, Delhi, India, August 21–26, 2005, . J. C Heyraud and J. J. M´etois, “Equilibrium shape of gold crystallites on a graphite cleavage surface: Surface In this example, s, x, F , and G are all positive.
Making Sense of the Legendre Transform
Sahoo and Klumpp calculated the fraction of the errors that are corrected by backtracking and transcript cleavage.
Template-directed biopolymerization: tape-copying Turing machines