Elasticity meaning : 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.