What is the meaning of Elasticity?

The property by virtue of which a material deformed under load can regain its original dimensions when unloaded

The sensitivity of changes in a quantity with respect to changes in another quantity.

A measure of the flexibility of a data store's data model and clustering capabilities.

A system's ability to adapt to changes in workload by automatically provisioning and de-provisioning resources.

The ratio of the relative change in a function's output with respect to the relative change in its input, for infinitesimal changes at a certain point.

The quality of being elastic.

Adaptability.

Source: wiktionary.org