In dictionaries:
Variable speed of light
A variable speed of light is a feature of a family of hypotheses stating that the speed of light may in some way not be constant, for example, that it varies in space or time, or depending on frequency.
One-way speed of light
When using the term "the speed of light" it is sometimes necessary to make the distinction between its one-way speed and its two-way speed.
faster than the speed of light
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