Nightlong (adjective)

1. Lasting throughout the entire night.
2. Happening or continuing throughout the night.

Origin:

From the word "night" and the suffix "-long" meaning lasting the entire night.

Examples:

1. The party went on nightlong.
2. The nightlong vigil was held to honor the deceased.
3. She had a nightlong conversation with her best friend.
4. The nightlong journey was tiring but worth it in the end.
5. The nightlong performance was a hit with the audience.