一级

first class / category A

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

level / grade / rank / step (of stairs) / CL:個|个[ge4] / classifier: step, level

first stage (diving)

first-rate / excellent (loanword from Japanese 一番, ichiban)

Grade One State protected (species)

Formula One

corporal (army)

first level