いっせいに · isseini
all at once, simultaneously
JLPT N3 adverbKanji in this word
Example sentences
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Kare ra wa issei ni warai hajime ta.
All at once they began to laugh.
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Kare ra wa issei ni sutaato shi ta.
They started all at once.
Example sentences from the Tatoeba Project, CC-BY 2.0 FR.