一等一

yīděngyī
(coll.) top-notch; first-rate; outstanding

CEDICT

colloquial

Entry Composition

1 一等 yīděng
  1. first class
  2. grade A
2 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