Etymology
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Words related to moment

*meue- 
*meuə-, Proto-Indo-European root meaning "to push away."

It forms all or part of: commotion; emotion; mob; mobile; moment; momentary; momentous; momentum; motif; motility; motion; motive; moto-; motor; move; movement; mutiny; premotion; promote; remote; remove.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit kama-muta "moved by love" and probably mivati "pushes, moves;" Greek ameusasthai "to surpass," amyno "push away;" Latin movere "move, set in motion;" Lithuanian mauti "push on."
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momentary (adj.)

"lasting but a moment, of short duration," mid-15c., momentare, from Late Latin momentarius "of brief duration," from Latin momentum "a short time, an instant" (see moment).

momently (adv.)

1670s, "from moment to moment, every moment," from moment + -ly (2). Meaning "at any moment" is attested from 1775.

momentous (adj.)

"of moment or consequence, critical, of surpassing importance," 1650s, from moment + -ous to carry the sense of "important" while momentary kept the meaning "of an instant of time." Related: Momentously; momentousness.

momentum (n.)

1690s in the scientific use in mechanics, "product of the mass and velocity of a body; quantity of motion of a moving body," from Latin momentum "movement, moving power" (see moment). Figurative use, "force gained by movement, an impulse, impelling force," dates from 1782.