superstitiō

Superstition comes from the Latin superstitiō (excessive religious awe, prophecy, superstition), from super (over, above) and stāre (to stand). The exact semantic development is debated. Cicero connected it to superstitem esse — being a survivor, standing over the dead in amazement. Others link it to 'standing over' in the sense of excessive observance — overdoing religious practice. The Romans used it to describe both foreign religions and Roman practices they considered excessive.

The word was a weapon. Romans called Christianity a superstitiō. Christians called Roman paganism a superstitiō. Each side used the same word to dismiss the other's beliefs. The distinction between religion and superstition was always political: my beliefs are religion; your beliefs are superstition. The word encoded contempt disguised as classification.

Enlightenment thinkers extended the concept. For Voltaire and Diderot, superstition was any belief unsupported by reason — which included, in their view, much of organized religion. The word became a tool of secularism. Calling something a superstition was declaring it irrational and therefore illegitimate.

Modern usage has softened. Walking under a ladder, breaking a mirror, the number thirteen — these are superstitions that most people acknowledge as irrational while sometimes observing them anyway. The word has lost its polemical edge. A superstition is now a small, harmless irrationality rather than a dangerous heresy. The Romans used it to condemn. We use it to apologize.