adjective

proprietary

CEFR C2

owned and controlled exclusively, not freely available to others

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Verified against

CEFR-J v1.5 + Octanove C1/C2Authoritative
Open English WordNet 2024Authoritative

Each source is a real, checkable word list that contains proprietary. We never claim an official exam-board list — none is published for the GRE, GMAT, or SAT.