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English word chaste comes from Proto-Indo-European *kesa
*kesa (Proto-Indo-European)
castus (Latin)
(ante-Classical, post-Classical) an abstinence from sensual enjoyments on religious grounds morally pure, guiltless. Pure, chaste, free from barbarisms. Religious, pious.
caste (Old French)
chaste (English)
Abstaining from sexual intercourse, celibate. Modest, decent, morally pure. Simple, austere, undecorative. Virginal, innocent, having had no sexual experience.