Proper Time 
interval between 2 events that occur at the same point in space 
Time Dilation 
clocks moving relative to an observer move more slowly than clocks at rest 


Proper Length 
length or distance between 2 points measured at the same time by an observer at rest with respect to the points 
Length Contraction 
length of an object is measured to be shorter when it is moving relative to the observer than when it is at rest 