Messenger (noun)

1. A person who carries messages or performs errands, often as a job.
2. A light line used for pulling a heavier one, as between ship and pier.
3. A collection of intracellular molecules that pass on a signal within a cell, such as a hormone.

Origin:

From middle english messager, from old french messagier, from message.

Examples:

1. The messenger delivered the package to my doorstep.
2. The ship sent a messenger ashore to deliver the news.
3. The messenger RNA carries genetic information from DNA to ribosomes for protein synthesis.