Plasticity means "changeability" or "moldability" — clay has a lot of plasticity, but a rock has almost none.

It helps to think of plastic when learning what plasticity means. See how plastic can be molded into all sorts of things, and even when it's in a totally solid form, it's not hard like stone? Plasticity refers to things that can still change their shape or function. The brain is something with high plasticity: if you have a brain injury, other parts of the brain can change to pick up the slack. Anything that is capable of evolving or being reshaped has plasticity.

Definitions of plasticity

n the property of being physically malleable; the property of something that can be worked or hammered or shaped without breaking

a lack of malleability
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ductileness, ductility
the malleability of something that can be drawn into threads or wires or hammered into thin sheets
flexibility, flexibleness
the property of being flexible; easily bent or shaped
bendability, pliability
the property of being easily bent without breaking
(golf) the flexibility of the shaft of a golf club
Type of:
physical property
any property used to characterize matter and energy and their interactions

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