the first generation

<c:colloq.> in one fell swoop / <c:figurative> in a breath / at the same time / all at once / all together / with one voice / unanimously / simultaneously / in union / <c:figurative> in chorus

the system of the one-naming of an emperor's reign

*one's last appearance on the stage

*one's supreme last stage appearance

once in a lifetime

once in *one's life / only one occurrence in *one's lifetime / happen once in *one's life

new field / new phase

one world

a speech / the first round (of a speech)