Performing, or appropriate to, the office of a protector; as, a guardian care. Feast of guardian angels a church festival instituted by pope Paul v, and celebrated on october 2d. Guardian angel. The particular spiritual being believed in some branches of the Christian church to have guardianship and protection of each human being from birth. Hence, a protector or defender in general. Guardian spirit, in the belief of many pagan nations, a spirit, often of a deceased relative or friend, that presides over the interests of a household, a city, or a region.