Semantic Change
Semantic change is the subfield of historical linguistics that investigates changes in sense. In 1892, the German philosopher Gottlob Frege argued that, although they refer to the same person, Jocasta and Oedipus’s mother, are not equivalent because they cannot be substituted for each other in some contexts; they have different “senses” or “values.” In contemporary linguistics, most researchers agree that words do not “have” meanings. Rather, words are assigned meanings by speakers and hearers in the context of use. Linguists distinguish semantic change from changes in “lexis” (vocabulary development, often in cultural contexts), although there is inevitably some overlap between the two. Semantic changes occur when speakers attribute new meanings to extant expressions. Changes in lexis occur when speakers add new words to the inventory, e.g., by coinage (“affluenza,” a blend of affluent and influenza), or borrowing (“sushi”). Linguists also distinguish organizing principles in research. Starting with the form of a word or phrase and charting changes in the meanings of that the word or phrase is known as “semasiology”; this is the organizing principle for historical dictionaries. Starting with a concept and investigating which different expressions can express it is known as “onomasiology”; this is the organizing principle for thesauruses.