Definitions for "Time dilation"
An effect caused by gravity or by acceleration in which the rate at which time passes in once location will be measured differently by a clock right there and another clock somewhere else
stretching or slowing down of time seen by an observer with respect to an object moving at high speed in a frame of reference different from that of the observer.
the effect that time moves more slowly in an inertial frame moving with respect to a stationary one.
relativistic incongruence of two interpretations of time due to differently accelerated reference frames