dynamic
 
dynamic
 (dī-nămʹĭk) adjective
also 
dynamical (-ĭ-kəl)
1.
	a. Of or relating to energy or to objects in motion. b. Of or relating to the study of dynamics.
2.	Characterized by continuous change, activity, or progress: a dynamic market. 
3.	Marked by intensity and vigor; forceful. See synonyms at active.  
4.	Of or relating to variation of intensity, as in musical sound. 
noun
1.
	An interactive system or process, especially one involving competing or conflicting forces: "the story of a malign dynamic between white prejudice and black autonomy" (Edmund S. Morgan). 
2.
	A force, especially political, social, or psychological: the main dynamic behind the revolution. 
 
[French dynamique, ultimately from Greek dunamikos, powerful, from dunamis, power, from dunasthai, to be able.]
 dynam
ʹically adverb