once-accentˈed adjective (music)

Marked with one accent, applied to the octave beginning with middle C

onceˈ-errand see errand

once-for-allˈ adjective

Done, etc, once and for all

once-oˈver noun

1. A single comprehensive survey
2. A quick (sometimes casual) examination
3. A violent beating

all at once

1. Suddenly
2. All at the same time, simultaneously

at once

1. Without delay
2. Alike
3. At the same time

for once

On one occasion only

once again or once more

One more time, as before

once and again

1. More than once
2. Now and then

once (or once and) for all

Once only and not again

once in a way or while

1. Occasionally
2. Rarely

once or twice

A few times

once upon a time

At a certain time in the past, the usual formula for beginning a fairy tale