at-once

(r) without delay or hesitation; with no time intervening
- he answered immediately
- found an answer straightaway
- an official accused of dishonesty should be suspended forthwith
- Come here now!
forthwith, immediately, instantly, like a shot, right away, straightaway, straight off, directly, now,
(r) simultaneously
- he took three cookies at a time
at a time, at one time,

Synonyms

forthwith immediately instantly like a shot right away straightaway straight off directly now at a time at one time

Words of close approximity