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lexical analysis
In computer science, this term refers to the first phase of a compiler, often called scanning. It focuses on the raw character stream, stripping away whitespace and comments to produce a stream of tokens. This is a low-level operation concerned with the alphabet and symbols of a language rather than its grammatical structure.
In linguistics, the term shifts toward the study of the lexicon. It involves analyzing how words are formed and distributed within a specific body of text. While the computing sense is about automation and translation, the linguistic sense is about observation and statistical patterns. This term is an uncountable noun and does not have a plural form.