a particular point in time

an indefinitely short time

at this time

having important effects or influence

a turning force produced by an object acting at a distance (or a measure of that force)

the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value

a logarithmic scale of 1 to 10 (a successor to the Richter scale) that enables seismologists to compare the energy released by different earthquakes on the basis of the area of the geological fault that ruptured in the quake

given two equal and opposite forces, the product of the force and the distance between them

the torque exerted on a magnet or dipole when it is placed in a magnetic field

the tendency of a body to resist angular acceleration

the moment in a bullfight when the matador kills the bull

a crucial moment on which much depends

lasting for a markedly brief time

for an instant or moment

at any moment

lasting for a markedly brief time

for an instant or moment

at any moment

of very great significance

in a momentous way

utmost importance

an impelling force or strength

the product of a body's mass and its velocity