Obs. rare1. [ad. L. castimōnia purity, chastity; ceremonial purity, f. cast-us chaste; see -MONY.] Chastity, purity.
1490. Caxton, Eneydos, ix. 37. To make foul the holy purpose of thy castymonye by thuntrue note of lykryke and slypper luxurye.