IPA: /ˌvɪskoʊɪˈlæstɪsɪti/
KK: /vɪskoʊɪˈlæstɪsɪti/
The ability of a material to stretch and return to its original shape while also flowing like a liquid when force is applied.
The viscoelasticity of the polymer allows it to absorb shocks and return to its original form.
Viscoelasticity is formed from "visco-" (from Latin "viscus", meaning viscous or sticky) and "elasticity" (from Greek "elastikos", meaning able to return to its original shape). The term describes a material's property that exhibits both viscous and elastic characteristics when deformed.
Think of a material that is both 'sticky' ('visco-') and 'able to return to shape' ('elasticity') — that's what viscoelasticity means.