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.

Example:
Is smoking a cigar Once every Once in awhile bad compared to smoking a box of cigarettes a day?

Taxonomy
Fox Searchlight, Glen Hansard, Glen, Marketa Irglova, Tour Diary, Falling Slowly, live performance, Swell Season, DVD, musical, music, Official Site, YouTube, JUNO, The Frames, the Oscars, the Irish, Cross-Country Tour.

Defination from the web:
... The ONCE Juggernaut: Rising Quickly. At the Oscars, the fresh-faced stars of the Irish movie "Once" seemed as if they had just rolled into Hollywood straight from busking on a Dublin ...