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A Lexicon in Festival is a subsystem that provides pronunciations for words. It can consist of three distinct parts: an addenda, typically short consisting of hand added words; a compiled lexicon, typically large (10,000s of words) which sits on disk somewhere; and a method for dealing with words not in either list.
| • Lexical entries | Format of lexical entries | |
| • Defining lexicons | Building new lexicons | |
| • Lookup process | Order of significance | |
| • Letter to sound rules | Dealing with unknown words | |
| • Building letter to sound rules | Building rules from data | |
| • Lexicon requirements | What should be in the lexicon | |
| • Available lexicons | Current available lexicons | |
| • Post-lexical rules | Modification of words in context |