Merriam-Webster's Collegiate® Dictionary, 11th Edition
DYNAMIC
I. adjective
Etymology: French dynamique, from Greek dynamikos powerful, from dynamis power, from dynasthai to be able
Date: 1827
1. (also dynamical) of or relating to physical force or energy, of or relating to dynamics,
2. marked by usually continuous and productive activity or change , energetic , forceful , requiring periodic refreshment of charge in order to retain data, dynamically adverb
II. noun
Date: 1868
a dynamic force, dynamics 2