Pythagorean Science Advisor Messages 4,430 Reaction score 327 Aug 17, 2011 #2 Depends on the context. It sometimes means the distance (in time units) between to cyclic events.
sophiecentaur Science Advisor Homework Helper Messages 30,548 Reaction score 7,530 Aug 17, 2011 #3 It can also refer to a state - as in Solid phase and liquid phase. You need to specify the context.