superstition

superstition, belief, half-belief, or practice for which there appears to be no rational substance. Those who use the term imply that they have certain knowledge or superior evidence for their own scientific, philosophical, or religious convictions. An ambiguous word, it probably cannot be used except subjectively. With this qualification in mind, superstitions may be classified roughly as religious, cultural, and personal. Every religious system tends to accumulate superstitions as peripheral beliefs—a Christian, for example, may...