element

n. 1 component part; contributing factor. 2 any of the substances that cannot be resolved by chemical means into simpler substances. 3 a any of the four substances (earth, water, air, and fire) in ancient and medieval philosophy. B a being's natural abode or environment. 4 electr. Wire that heats up in an electric heater, kettle, etc. 5 (in pl.) Atmospheric agencies, esp. Wind and storm. 6 (in pl.) Rudiments of learning or of an art etc. 7 (in pl.) Bread and wine of the eucharist.  in one's element in one's preferred situation, doing what one does well and enjoys. [french from latin]

n. One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.