from Dictionary.Com:dy·nam·ic
[dahy-nam-ik]adjective Also, dy·nam·i·cal.
1. pertaining to or characterized by energy or effective action; vigorously active or forceful; energetic: the dynamic president of the firm.
2.Physics .
a.of or pertaining to force or power.
b.of or pertaining to force related to motion.
dynamics: . ( used with a plural verb 
) the motivating or driving forces, physical or moral, in any field.
) the motivating or driving forces, physical or moral, in any field. Word Origin & History
dynamic 1817, as a term in philosophy; 1827 in the sense "force producing motion," from Fr. dynamique (1762), from Ger. dynamisch, introduced by Leibnitz 1691 from Gk. dynamikos "powerful," from dynamis "power," from dynasthai "be able to have power," of unknown origin. The figurative sense of "active, potent,
Online Etymology Dictionary, © 2010 Douglas Harper
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