What term is used to indicate an omen or the practice of divination?

The term that indicates an omen or the practice of divination is "augury." Augury comes from ancient practices where individuals, often priests, interpreted the behavior of birds and other natural phenomena to predict future events or discern the will of the gods. It reflects a method of interpreting signs or omens to make forecasts, thereby linking it directly to divination. This practice has historical significance in various cultures, illustrating its enduring impact on how societies comprehend and predict occurrences in life.

In contrast, the other terms relate to different meanings and are not associated with the concept of omens or divination. Aspersion refers to a damaging or derogatory remark, avow means to assert or confess openly, and antithetical indicates something that is directly opposed or contrasted, which does not connect with the idea of foretelling or omens.