|[This is a MPIWG MPDL language technology service]|
Once (adv.) By limitation to the number one; for one time; not twice nor any number of times more than one.
Once (adv.) At some one period of time; -- used indefinitely.
Once (adv.) At any one time; -- often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched.