The study and representation of meaning in language. Lexical interpretation and sentence interpretation require interacting information; a contrast with a syntactic task need not isolate every semantic process.
A relation based on meaning among concepts or expressions. Semantic-association judgments must be distinguished from perceptual similarity and response-selection demands.
A relation specifying how an entity participates in a described event, such as an agent or recipient. Grammatical constructions can assign different roles to the same familiar words, making reversible sentences useful in comprehension tests.

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Semantics is the study of meaning in language, focusing on how words, phrases, sentences, and texts convey meaning. It involves the interpretation of linguistic expressions and explores the relationships between signifiers—like words and phrases—and what they refer to or signify in real-world contexts. Semantics plays a critical role in various fields, including linguistics, philosophy, artificial intelligence, and cognitive science, as it helps to understand how language is used to communicate ideas, emotions, and information.