The science that deals with signs or sign language.(noun)
The use of signs in signaling, as with a semaphore.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "semiology" in a sentence
"The name derives from the word "semiology," the study of signs and symbols."
"This "semiology" always has been, I think, flirting on the edge of a mysticism that comes both from an American inclination towards transcendentalism and the impossible to calculate influence of Ludwig Wittgenstein on subsequent philosophers of language working in the same philosophical tradition of British Empiricism where he and his students did most of their work."
"I wonder if this verbal torture is something to do with Gervais having studied philosophy for three years; perhaps he took courses in semantics and semiology while he was at it."