Felony. The act or offense by which a vassal forfeited his fee. Spelman ; Calvin. Per feloniam, with a criminal intention. Co. Litt. 391. Felonia, ex vi termini significat quodlibet capitale crimen felleo animo perpetratnm. Co. Litt. 391. Felony, by force of the term, signifies any capital crime perpetrated with a malignant mind. Felonia implicatur in quolibet proditione. Felony is implied in every treason.