Human language is often described in terms of levels: lexical, syntactic, semantic and pragmatic. Semantics is about the fundamental meaning of langauge, for example the idea of a dog as an animal. However, the term is also used for computing constructs including programming languages, and within HCI as a synonym for the application interface component in the Seeheim model.
Used in glossary entries: application interface, lexical, Seeheim model, syntactic