guest Definition

1. Someone who receives hospitality in the home of, or at the expense of, another.

Thesaurus: visitor, caller; company.
2. Someone who stays at a hotel, boarding-house, etc.

Thesaurus: tenant, boarder, patron, customer, habitué, sojourner, frequenter, lodger, regular, renter.
3. A person specially invited to take part.

Example: guest star
Example: guest speaker

intr
guested, guesting
1. To appear as a guest, eg on a television show.