In linguistics, lexis describes the storage of language in our mental Lexicon as prefabricated patterns that can be recalled and sorted into meaningful speech and writing. Recent research in corpus linguistics suggests that the long-held dichotomy between grammar and vocabulary does not exist. Lexis as a concept differs from the traditional paradigm of grammar in that it defines probable language use, not possible language usage. This notion contrasts starkly with the Chomskian proposition of a “Universal Grammar” as the prime mover for language; grammar still plays an integral role in lexis, of course, but it is the result of accumulated lexis, not its generator. In short, the Lexicon is • Formulaic: it relies on partially-fixed expressions and highly probable word combinations • Idiomatic: it follows conventions and patterns for usage • Metaphoric: concepts such as time and money, business and sex, systems and water all share a large portion of the same vocabulary • Grammatical: it uses rules based on sampling of the Lexicon • Register-specific: it uses the same word differently and/or less frequently in different contexts