An appropriate time for doing something; an opportunity
A particular stage in something's development or in a course of events
Importance
A turning effect produced by a force acting at a distance on an object
The magnitude of such an effect, expressed as the product of the force and the distance from its line of action to a given point
A quantity that expresses the average or expected value of the first, second, third, or fourth power of the deviation of each component of a frequency distribution from some given value, typically mean or zero. The first moment is the mean, the second moment the variance, the third moment the skew, and the fourth moment the kurtosis