Elasticity

noun

1. The property by virtue of which a material deformed under load can regain its original dimensions when unloaded
2. The sensitivity of changes in a quantity with respect to changes in another quantity.

   "If the sales of an item drop by 5% when the price increases by 10%, its price elasticity is -0.5."

3. A measure of the flexibility of a data store's data model and clustering capabilities.
4. A system's ability to adapt to changes in workload by automatically provisioning and de-provisioning resources.
5. 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.