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There semantics (from the Greek sêma, "sign") is that part of linguistics that studies the meaning of words (lexical semantics), sets of single letters (in and of ancient alphabets) and phrases (phrasal semantics) and texts.
A set of terms that have a semantic factor in common is called a semantic field.
The term "sema" indicates the smallest unit of meaning identified by semantics. 
The position of semantics, studied in the context of a general theory of signs, becomes clearer when compared with pragmatics and syntax. In fact, it can be stated that: