Linked from
The 8 pages that link to Lexicon, each with the reason it gives.
Constructed languageRelated: A constructed language's chosen vocabulary reflects its design goals.
Natural languageRelated: Shared vocabularies let communities build and understand utterances.
ScrabbleRelated: A designated lexicon determines which attempted plays are valid.
Spoken languageRelated: The lexicon supplies the words selected for spoken utterances.