'Cohesion' definitions:

Definition of 'cohesion'

noun

The state of cohering or sticking together [syn: coherence, coherency, cohesion, cohesiveness] [ant: incoherence, incoherency]

noun

(botany) the process in some plants of parts growing together that are usually separate (such as petals)

noun

(physics) the intermolecular force that holds together the molecules in a solid or liquid

From: GCIDE

Cohesion \Co*he"sion\, n. [Cf. F. coh['e]sion. See Cohere.]
1. The act or state of sticking together; close union. [1913 Webster]
2. (Physics) That from of attraction by which the particles of a body are united throughout the mass, whether like or unlike; -- distinguished from adhesion, which unites bodies by their adjacent surfaces. [1913 Webster]
Solids and fluids differ in the degree of cohesion, which, being increased, turns a fluid into a solid. --Arbuthnot. [1913 Webster]
3. Logical agreement and dependence; as, the cohesion of ideas. --Locke. [1913 Webster]