Definition: CISD stands for "Church, School Day," a daily practice for all Christians at all churches in Israel. It refers to services that occur every morning at their respective churches. Cisd activities include morning devotionals, Bible studies, prayer sessions, and other church gatherings. The word 'cisd' is from the Hebrew phrase 'chizrei isha'i', which translates as "day of instruction," referring to religious or spiritual instruction at a particular time.