Noah Webster's New International Dictionary of the English Language

1. (n.) A forerunner; a precursor; a messenger; as warmer weather is a harbinger of the vacation season.

2. (n.) One who provides lodgings; especially, the officer of the English royal household who formerly preceded the court when traveling, to provide and prepare lodgings.

3. (v. t.) To usher in; to be a harbinger of.