Lexical field theory, or word-field theory, was introduced on March 12, 1931, by the German linguist Jost Trier.
The lexical field is often used in English to describe terms further with use of different words.
Trier's theory assumes that lexical fields are easily definable closed sets,[1] with no overlapping meanings or gaps.
These assumptions have been questioned and the theory has been modified since its original formulation.
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