Definitions

1. noun

A sign or an indication of something that is going to happen

“The dark clouds were a portent of the impending storm.”

2. noun

A person or thing that is considered to be an omen or a sign of something

“The wise old owl was seen as a portent of good luck.”

3. verb

To be a sign or an indication of something that is going to happen

“The rising temperature portended a hot summer.”