One slice or cut of something.

one slice or cut of something / (rare) a one-time sexual liaison, a one-night stand

(informal, of movement) skilfully sharp and brisk

(informal, of movement) being skilfully sharp and brisk

all, entirety, the whole, everything

one division, one step, one part of something / one moment, one time / (theater, performing arts) one act, one scene

once

wholly, entirely, completely, at all

all, entirety, the whole, everything

wholly, entirely, completely, at all