Webster's English Dictionary

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dynamics

dy.nam.ics \di--'nam-iks\ n pl but sing or pl in constr  1: a branch of 
   mechanics that deals with forces and their relation primaril y to the 
   motion but sometimes also to the equilibrium of bodies of matter 2: the 
   driving physical, moral, or intellectual forces of any area or the l aws 
   relating to them 3: the pattern of change or growth of an object or 
   phenomenon  4: variation and contrast in force or intensity (as in music)