 It is often used as a synonym of semantics (the study of the meaning of words, phrases, and longer forms of expression).However, semasiology is also sometimes considered part of lexical semantics, a narrow subfield of lexicology (the study of words) and semantics.The term was first used in German by Christian Karl Reisig in 1825 in his work, ["Lectures on Latin Linguistics"] (), and was used in English by 1847.