one-shot
one-sided
one-term
one-year
on-going
ongoing
only
on-the-job
on-the-record
onus
  open
open-court
open-end
open-ended
opening
openly
operandi
operate
operating
operation
operational

    open defence

    обстоятельство , на которое можно сослаться как на исключающее ответственность