This is the 4943rd most frequent German word.
allegra
"Allegra" is not a standard German word; it is a greeting meaning "joyful" or "cheerful" in Romansh, a minority language spoken in Switzerland.
Used as a greeting expressing goodwill and a friendly tone.
Allegra, ich hoffe, dass es dir gut geht.
Allegra, I hope that you are doing well.
Used to describe a state of cheerfulness or vibrancy in demeanor.
Die Allegra der Gastgeberin beeindruckte alle Anwesenden.
The cheerfulness of the hostess impressed everyone present.
Here 'Allegra' functions as a salutation or address to the recipient at the start of a message.