: the quality or state of being plastic; especially: capacity for being molded or altered
: the ability to retain a shape attained by pressure deformation
: the capacity of organisms with the same genotype to vary in developmental pattern, in phenotype, or in behavior according to varying environmental conditions
: the capacity for continuous alteration of the neural pathways and synapses of the living brain and nervous system in response to experience or injury that involves the formation of new pathways and synapses and the elimination or modification of existing ones
Ability of certain solids to flow or to change shape permanently when subjected to stresses between those that produce temporary deformation, or elastic behaviour, and those that cause failure of the material, or rupture (seefracture). Plasticity allows a solid under the action of outside forces to become permanently deformed without rupturing; elasticity enables a solid to return to its original shape after the load is removed. Plastic deformation occurs in many metal-forming processes (rolling, pressing, forging, wire drawing) and in geologic processes (rock folding and rock flow within the Earth under extremely high pressures and at elevated temperatures).