一元

yīyuán
(math.) single-variable; univariate

CEDICT

math

Entry Composition

1 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
2 元 yuán
  1. currency unit (esp. Chinese yuan)
  2. (bound form) first; original; primary
  3. (bound form) basic; fundamental
  4. (bound form) constituent; part
  5. (prefix) meta-
  6. (math.) argument; variable
  7. era (of a reign)
  8. (Tw) (geology) eon