An augur was a priest and official in the classical Roman world. His main role was the practice of augury: Interpreting the will of the gods by studying the flight of birds – whether they were flying in groups or alone, what noises they made as they flew, direction of flight, and what kind of birds they were. This was known as “taking the auspices”.
The augural ceremony and function of the augur was central to any major undertaking in Roman society – public or private – including matters of war, commerce, and religion. Augurs sought the divine will regarding any proposed course of action which might affect Rome's pax, fortuna, and salus (peace, good fortune, and well-being)
Why would anyone use that word? To confuse?
“Why would anyone use that word? To confuse?”
No, to educate.
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The word is usually not used as a noun. You've probably heard the word used in an idiom that something doesn't augur well.