noun (used with a singular verb)
the study of meaning.
the study of linguistic development by classifying and examining changes in meaning and form.
Also called significs. the branch of semiotics dealing with the relations between signs and what they denote.
the meaning, or an interpretation of the meaning, of a word, sign, sentence, etc.: Let's not argue about semantics.

1895–1900; see semantic, -ics

semanticist [si-man-tuh-sist] , semantician [see-man-tish-uhn] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
semantics (sɪˈmæntɪks)
1.  the branch of linguistics that deals with the study of meaning, changes in meaning, and the principles that govern the relationship between sentences or words and their meanings
2.  the study of the relationships between signs and symbols and what they represent
3.  logic
 a.  the study of interpretations of a formal theory
 b.  the study of the relationship between the structure of a theory and its subject matter
 c.  (of a formal theory) the principles that determine the truth or falsehood of sentences within the theory, and the references of its terms

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"science of meaning in language," 1893, from Fr. sémantique (1883); see semantic (also see -ics). Replaced semasiology (1847), from Ger. Semasiologie (1829), from Gk. semasia "signification, meaning."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

semantics se·man·tics (sĭ-mān'tĭks)

  1. The study or science of meaning in language forms.

  2. The study of the relationships between various signs and symbols and what they represent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

semantics definition

The scientific or philosophical study of the relations of words and their meanings.

Note: Semantics is commonly used to refer to a trivial point or distinction that revolves around mere words rather than significant issues: “To argue whether the medication killed the patient or contributed to her death is to argue over semantics.”
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

semantics definition

The meaning of a string in some language, as opposed to syntax which describes how symbols may be combined independent of their meaning.
The semantics of a programming language is a function from programs to answers. A program is a closed term and, in practical languages, an answer is a member of the syntactic category of values. The two main kinds are denotational semantics and operational semantics.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
But semantics aside, the probe's journey is entirely remarkable.
The answer first hinges on semantics, as science defined as knowledge does not
  require skepticism.
For example, artificial intuition is currently being used to understand
  semantics in language.
The first is discovery and science, whereas the second is quibbling over
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