Which term can be described as an omen of positive significance?

The term "auspice" is derived from the practice of interpreting the actions of birds to predict future events, particularly favorable outcomes. In this context, it denotes a sign or indicator of luck or favorable circumstances. Hence, when something is described as an "auspice," it suggests that it is a positive omen or a guiding influence that heralds good fortune or auspiciousness.

"Augury" also refers to the practice of interpreting omens, but it can encompass both positive and negative signs, making it less specific in indicating positive significance alone. Meanwhile, "calumniate" means to falsely accuse someone or slander them, and relates to negative actions against individuals rather than omens. "Asperity" refers to harshness or severity in tone or manner, which also has no connection to positive significance. Thus, the clarity and direct association of "auspice" with positive omens distinguishes it as the correct choice.