How do you spell Once

Available Definitions:
1)  adv. - By limitation to the number one; for one time; not twice nor any number of times more than one.
2)  adv. - At some one period of time; -- used indefinitely.
3)  adv. - At any one time; -- often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched.