二次

èrcì
  1. second (i.e. number two)
  2. second time
  3. twice
  4. (math.) quadratic (of degree two)

CEDICT

math

Entry Composition

1 二 èr
  1. two
  2. 2
  3. (Beijing dialect) stupid
2 次 cì
  1. next in sequence
  2. second
  3. the second (day, time etc)
  4. secondary
  5. vice-
  6. sub-
  7. infra-
  8. inferior quality
  9. substandard
  10. order
  11. sequence
  12. hypo- (chemistry)
  13. classifier for enumerated events: time