Saussure's langue/parole and the sign; the Prague and Paris schools; Greimas's structural semantics and the semiotic square (1966, with Rastier 1968).
The French turn after structuralism: Derrida, Foucault, Deleuze, Lyotard, Baudrillard.
Study of language variation and conversational alignment: discourse LIKE and quotatives (D'Arcy, Tagliamonte, Buchstaller), accommodation theory (Giles), interactive alignment in dialogue (Pickering and Garrod).
Conceptual metaphor, image schemas, blending and structure-mapping theories of analogy (Lakoff and Johnson, Fauconnier and Turner, Gentner, Holyoak and Gick, Hofstadter; Daugman on brain metaphors).
Chomsky's generative grammar, Tesniere's dependency grammar, Fillmore's frames, Mel'cuk's Meaning-Text Theory, Kennedy and McNally on scales.