Definition of "prolog" [pro•log]

• A speech or section used as an introduction, especially to a play or novel. (noun)
• A component of a computer program that prepares the computer to execute a routine. (noun)

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• "Some AI languages such as prolog are designed for just such a purpose."
• "In other words, the kind of prolog no one actually reads."
• "First: users are allowed to specify a "prolog" file."