momentum

mo·men·tum [moh-men-tuhm]
noun, plural -ta
1. force or speed of movement; impetus, as of a physical object or course of events.
2. the property or tendency of a moving object to continue moving.
3. A minute portion of time; a point of time; an instant; as, at that very moment.
4. An essential element; a deciding point, fact, or consideration; an essential or influential circumstance.
5. An infinitesimal change in a varying quantity; an increment or decrement.
6. Importance, as in influence or effect; consequence; weight or value; consideration.