
1) Concept in physics
Found on
https://www.crosswordclues.com/clue/time-dilation

In the theory of relativity, time dilation is an actual difference of elapsed time between two events as measured by observers either moving relative to each other or differently situated from gravitational masses. An accurate clock at rest with respect to one observer may be measured to tick at a different rate when compared to a second observer....
Found on
http://en.wikipedia.org/wiki/Time_dilation

in the theory of special relativity, the `slowing down` of a clock as determined by an observer who is in relative motion with respect to that clock. ... [5 related articles]
Found on
http://www.britannica.com/eb/a-z/t/51

the idea that time travels slower for somebody in a moving reference frame; consequence of relativity.
Found on
http://www.chemistry-dictionary.com/definition/time+dilation.php

A phenomenon predicted by the special theory of relativity in which the passage of time in the frame of reference of a moving object slows down as the object approaches the speed of light. Effectively, this makes it possible to spend energy to buy time. Time dilation has been experimentally confirme...
Found on
http://www.daviddarling.info/encyclopedia/T/timedilation.html

Stretching of time produced by relativity. Time dilation is a predicted effect of the cosmological paradigm.
Found on
http://www.encyclo.co.uk/local/20040

Time in the moving reference frame always flows more slowly. Time is slowed by about 40 nanoseconds in a flight from London to New York but the effect is more easily observed at speeds approaching that of light. Time will also pass more slowly in a strong gravitational field than in a weak one. See also: Length Contraction, Proper Time.
Found on
https://www.encyclo.co.uk/local/20687

The idea that as you approach the speed of light time slows down and mass increases.
Found on
https://www.encyclo.co.uk/local/22784
No exact match found.