Something interpreted from a bird's behavior, in the ancient Greek practice of ornithomancy (4)

I believe the answer is:

omen

(Other definitions for omen that I've seen before include "Harbinger, prophetic sign" , "Portent of things to come" , "Portent, prophetic indicator" , "Straw in the wind" , "Gloomy sign" .)

I've seen this clue in The New York Times.

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