a minute portion of time; a point of time; an instant; as, at thet very moment.-impulsive power; force; momentum.-importance, as in influence or effect; consequence; weight or value; consideration.-an essential element; a deciding point, fact, or consideration; an essential or influential circumstance.-an infinitesimal change in a varying quantity; an increment or decrement.-tendency, or measure of tendency, to produce motion, esp. motion about a fixed point or axis.