adv. Obs. [f. CAUSARY + -LY2.] By reason of a legally recognized cause.
1651. W. G., trans. Cowels Inst., 38. There is also a Guardian simply and originally so called, and a Guardian by accident, from the cause of custody . Causarily, is he who for that he hath the custody of his own Tenant being yet an Infant hath upon that score the custody of another who is Tenant to his Ward.