Etymology
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semiology (n.)

1690s, "sign language, the use of gestures to express thought," a sense now obsolete, from Greek sēmeion "a sign, mark, token," from sēma "sign, mark, token" (see semantic, and compare semiotic) + -ology. As "the branch of medical science concerned with morbid symptoms," 1839; as "logical theory of signs" by 1923. Related: Semiological.

updated on April 28, 2022

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Definitions of semiology from WordNet

semiology (n.)
(philosophy) a philosophical theory of the functions of signs and symbols;
Synonyms: semiotics
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.