Answer: FOURTHDIMENSION

AnswerCrossword Clue
FOURTHDIMENSIONTime, relatively speaking
FOURTHDIMENSIONTime, to a physicist
FOURTHDIMENSIONTime
FOURTHDIMENSIONTime coordinate.
FOURTHDIMENSIONTime, to a physicist.
FOURTHDIMENSIONTime.
FOURTHDIMENSIONTime, to Einstein
FOURTHDIMENSIONSee circles
FOURTHDIMENSIONHypothetical unit in theory of relativity