What is the science of meanings or sense development (of words); the explanation of the development and changes of the meanings of words. --Se*ma`si*o*log"ic*al (#), a called?

semasiology — The science of meanings or sense development (of words); the explanation of the development and changes of the meanings of words. --Se*ma`si*o*log"ic*al (#), a. (Webster's 1913.)

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