Definitions

1. noun

A sign or indication of something about to happen, especially something bad or unpleasant

“The strange noise in the night was an omen of the storm that was coming.”

2. noun

A supernatural sign or portent, especially a bad one

“The astrologer claimed that the alignment of the stars was an omen of disaster.”

3. noun

A sign or indication of the quality or character of something

“The gloomy atmosphere of the old mansion was an omen of the dark secrets it held.”