ascertain
C1CEFR level
50/100Rarity: uncommon
TechnicalRegister
To find out or establish something with certainty.
Further imaging was arranged to ascertain the cause of the swelling.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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