Webster's English Dictionary

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momentum

mo.men.tum \mo--'ment-*m, m*-'ment-\ \-'ment-*\ n or mo.men.ta or momentums 
   [NL, fr. L, movement] pl  : a property of a moving body that determines the 
   length of time required  to bring it to rest when under the action of a 
   constant force or moment; broadly : IMPETUS