Senses
一元 one yuan
one unit of currency
一元 unitary
consisting of a single element or a single principle; also used in math to mean a single variable or univariate
一元 beginning
the beginning or origin of things, as used in the phrase 一元复始
一元 calendrical cycle
period of 4,617 years in ancient Chinese calendars
一元 silver ingot
one silver ingot (yuanbao) during the Qing dynasty