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The official definition of semantics:

“The branch of linguistics and logic concerned with meaning. There are a number of branches and subbranches of semantics, including formal semantics, which studies the logical aspects of meaning, such as sense, reference, implication, and logical form, lexical semantics, which studies word meanings and word relations, and conceptual semantics, which studies the cognitive structure of meaning.”

The simplified definition:

“The meaning and interpretation of words, signs, and sentence structure.”

(Courtesy of a quick Google search.)