momentum

gravitas – dignity, importance, seriousness, weight
gravitus – weight
onus – burden, charge, load, public road tax, trouble, weight
pondus – a pound's weight, constancy, firmness, heavy body, load, mass, weight, weight of character

monumentum – memorial or token of remembrance, remembrance
motum – affect, arouse, influence, to move
monitum – admonition
moderamen – direction, management
moderor – conduct, diminish, direct, govern, manage, measure, mitigate, play an instrument, take with moderation, temper, to guide, to moderate
modeste – discreetly, meekly
modestia – meekness, moderation
modestus – meek, moderate, orderly, restrained, within bounds
modica – limited, moderate, undistinguished, within bounds
modicus – meager, ordinary, scanty, undistinguished, within bounds

mo·men·tum[1]