Semantic Change

Semantic Change
From Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Semantic_change

Semantic change, also known as semantic shift or semantic progression describes the evolution of word usage — usually to the point that the modern meaning is radically different from the original usage. In diachronic (or historical) linguistics, semantic change is a change in one of the meanings of a word. Every word has a variety of senses and connotations which can be added, removed, or altered over time, often to the extent that cognates across space and time have very different meanings. Semantic change is one of three major processes to find a designation for a concept. The study of semantic change can be seen as part of etymology, onomasiology, semasiology and semantics.

e.g.

Gay


The term gay was originally used, until well into the mid-20th century, primarily to refer to feelings of being "carefree", "happy", or "bright and showy"; it had also come to acquire some connotations of "immorality" as early as 1637.

The term later began to be used in reference to homosexuality, in particular, from the early 20th century, a usage that may have dated prior to the 19th century. In modern English, gay has come to be used as an adjective, and occasionally as a noun, that refers to the people, practices, and culture associated with homosexuality.