an increase in the time interval between events measured by a moving observer (see equation 25.2)

A prediction of the theory of relativity, closely related to the gravitational reshift. To an outside observer, a clock lowered into a strong gravitational field will appear to run slow.

The phenomenon that a moving clock loses time in relation to a stationary clock. The difference depends on the speed. If the speed is low in comparison to the speed of light, the effect is not noticeable. Einstein described time dilation for the first time in his work on the theory of relativity in 1905. Only in 1971 was the effect experimentally demonstrated with atomic clocks.

A consequence of the Special Theory of Relativity. It states that time slows down for an observer in motion or influenced by gravity.

The resulting fluidity of time because of speed and/or gravitational conditions. Time is not an absolute.

The increase in the time between two events as measured by an observer who is outside of the reference frame in which the events take place. The effect occurs in both Special and General Relativity and is quite pronounced for speeds approaching the speed of light and in regions of high gravity.

in special relativity, moving clocks appear to run slowly when compared to stationary clocks. This clock slowing is called time dilation.

In special relativity, the phenomenon whereby the time measured by a uniformly moving clock present at two events is shorter than that measured by separate clocks located at the two events. In general relativity, the phenomenon of time running slower in a region of stronger gravity (greater spacetime curvature).

Time dilation is the phenomenon whereby an observer finds that another's clock which is physically identical to their own is ticking at a slower rate as measured by their own clock. This is often taken to mean that time has "slowed down" for the other clock, but that is only true in the context of the observer's frame of reference. Locally, time is always passing at the same rate.