To sing or play music for someone you love, especially outside their window at night.
Serenading is often seen as romantic and sweet, like in old stories.
Examples:
He will serenade her with a love song.
The prince serenaded the princess under her window.
She loves it when he serenades her with his guitar.
I tried to serenade my cat, but she didn't like it.
The birds serenade us every morning with their songs.
He serenaded her with a beautiful melody.