[...] a lexicon is a data structure in which words are listed in an unordered way, and where each word is represented by a specification of its relevant features: its phonological shape, its categories and its meaning.
- Hoeksma (2004), Pag. 193

[...] lexicon is a distinct component of the grammar [...].
- Hoeksma (2004), Pag. 185

By "lexicon", we will understand that part of a grammar, which takes care of the vocabulary of the language, including its rules of word-formation.
- Hoeksma (2004), Pag. 185