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Substitution is the replacement of one thing with another. Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 151 languages. ...

In mathematics: For other meanings of mathematics or uses of math and maths, see Mathematics (disambiguation) and Math (disambiguation). ...

• Substitution rule, in calculus
• FOPL#Substitution, in logic
• The substitution method of solving simultaneous equations
• Substitution property of equality, in mathematics
• Substitution cipher, in cryptography
• String substitution, in theoretical computer science

In science and technology: In calculus, the substitution rule is a tool for finding antiderivatives and integrals. ... First-order logic (FOL) is a formal deductive system used by mathematicians, philosophers, linguists, and computer scientists. ... In Mathematics simultaneous equations are a set of equations containing multiple variables. ... See also the disambiguation page title equality. ... In cryptography, a substitution cipher is a method of encryption by which units of plaintext are substituted with ciphertext according to a regular system; the units may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. ... In computer science, in the area of formal language theory, frequent use is made of a variety of string functions; however, the notation used is different from that used on computer programming, and some commonly used functions in the theoretical realm are rarely used when programming. ... A magnet levitating above a high-temperature superconductor demonstrates the Meissner effect. ... By the mid 20th century humans had achieved a mastery of technology sufficient to leave the surface of the Earth for the first time and explore space. ...

• Substitution (chemistry), in organic chemistry
• Substitution method, in the testing of optical fiber
• Substitution mutation is synonymous with point mutation in genetics
• Virtual Reality as a substitute for Reality

In economics: Substitution in the context of organic chemistry has the general meaning of replacing an atom, a functional group, or a substituent in a molecule. ... In optical fiber technology, the substitution method is a method of measuring the transmission loss by (a) using a stable optical source, at the wavelength of interest, to drive a mode scrambler, the output of which overfills (drives) a 1-meter to 2-meter reference fiber having physical and optical... A point mutation, or substitution, is a type of mutation that causes the replacement of a single base nucleotide with another nucleotide. ... This article is about the general scientific term. ... This article is about the simulation technology. ... For other uses, see Reality (disambiguation). ... Face-to-face trading interactions on the New York Stock Exchange trading floor. ...

• Import substitution in trade
• Substitute good, in consumer theory

In medicine: Import substitution industrialization (also called ISI) is a trade and economic policy based on the premise that a developing country should attempt to substitute products which it imports, mostly finished goods, with locally produced substitutes. ... In economics, one kind of good (or service) is said to be a substitute good for another kind insofar as the two kinds of goods can be consumed or used in place of one another in at least some of their possible uses. ... For the chemical substances known as medicines, see medication. ...

• Substitution therapy for opiates

In Analytic psychology: Opiate Replacement Therapy (ORT) is the medical procedure of replacing an illegal opiate drug such as heroin with a longer acting but less euphoric opiate such as methadone or buprenorphine. ... Today psychoanalysis comprises several interlocking theories concerning the functioning of the mind. ...

• It is a defence mechanism where a person replaces one feeling or emotion for another.

Other uses: In psychoanalytic theory, defence mechanisms are unconscious resources used by the ego to reduce conflict between the id and superego and thereby anxiety. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Look up Emotion in Wiktionary, the free dictionary. ...

• Chord substitution, in music
• Substitution (law), a legal right to change a judge that may be biased.
• Substitution (theatre), an acting methodology
• Substitutes, in sport
• Substitutionary Covenantal Representation in Biblical Theology

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