guest

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guest

1. 
a. an actor, contestant, entertainer, etc., taking part as a visitor in a programme in which there are also regular participants
b. (as modifier): a guest appearance
2. a patron of a hotel, boarding house, restaurant, etc.
3. Zoology a nontechnical name for inquiline

guest

[gest]
(chemistry)
Cationic, anionic, or neutral organic, inorganic, or biological substance, bound by means of various interactions (electrostatic, hydrogen bonding, van der Waals, donor-acceptor) within a crystalline or molecular structure. Also known as guest molecule; guest substance.

guest

A person who logs into a network or service that does not have a user account. Guests are given a default set of privileges until they officially register with the service. See guest account, guest privileges and user account. See also guest operating system.