all at once
all together
as one
as one man
at a blow
at a clip
at a stroke
at once
at one blow
at one jump
at one stroke
at one swoop
at one time
at that time
coincidentally
coinstantaneously
concurrently
contemporaneously
forthwith
in a chorus
in a hurry
in chorus
in concert with
in phase
in sync
in unison
isochronously
now
on that occasion
on the beat
per saltum
pronto
right away
right now
right off
straightaway
straightway
subito
synchronously
then
then and there
this minute
this very minute
together
uno saltu
with one voice
without delay
simultaneity
extraneously
spontaneously