What does "treasonable" mean?

Treasonable: Pertaining to treason; consisting of treason; involving the crime of treason, or partaking of its guilt. Most men's heads had been intoxicated with imaginations of plots and treasonable practices. Clarendon. -- Trea"son*a*ble*ness, n. -- Trea"son*a*bly, adv.

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