Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Commissum

One sense of this word is that of “forfeited,” which is derived from the sense of the verb committere, “to attach legal effect to,” “to make operative.” Hence property forfeited by the coming into effect of a condition was said to be commissum, as when a lex commissoria (q. v.) was attached to a mortgage (pignus). Commissa hereditas is an inheritance forfeited as a penalty (Verr. i. 10.27).