Definitions of moment:

• noun:   the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value
• noun:   the moment of a couple is the product of its force and the distance between its opposing forces
• noun:   a particular point in time

  Example: "The moment he arrived the party began"

• noun:   an indefinitely short time

  Example: "Wait just a moment"

• noun:   having important effects or influence

  Example: "Virtue is of more moment that security"

• noun:   at this time

  Example: "She is studying at the moment"

• name:  A surname (very rare: popularity rank in the U.S.: #50348)