ascertained
/ˌæsəˈteɪnd/verb
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To find out definitely; to discover or establish.
"As soon as we ascertain what the situation is, we can plan how to proceed."
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To make (someone) certain or confident about something; to inform.
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To establish, to prove.
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To ensure or effect.
Synonyms:
determine, discover, establish, find out, learn, work out