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Children's Dictionary
at once now; immediately; without any delay. [1/2 definitions]
first off at once; immediately.
instantly at once; without delay; immediately.
next coming immediately after; following. [3/4 definitions]
now directly; immediately. [1/7 definitions]
on the double (informal) right away; immediately.
on the spot at once; immediately. [1/2 definitions]
outright immediately or all at once. [1/4 definitions]
prompt done immediately and without pause. [1/4 definitions]
right without delay; immediately. [1/21 definitions]
right away at once; immediately.
right off at once; immediately.
right off the bat at once; immediately.