• WordNet 3.6
    • adj cognoscible capable of being known
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Webster's Revised Unabridged Dictionary
    • Cognoscible Capable of being known. "Matters intelligible and cognoscible ."
    • Cognoscible Liable to judicial investigation.
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Century Dictionary and Cyclopedia
    • cognoscible Capable of being known.
    • cognoscible Liable or subject to judicial investigation.
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In literature:

There are people who give dinners, and who are not cognoscible.
"The Rise of Silas Lapham" by William Dean Howells
Or, in other words, they are only cognoscible as a colligation of incongruous coalescences.
"The Travelling Companions" by F. Anstey