Substitution

In general, substitution is the replacement of one thing with another. There are many specific examples:

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• Substitution in organic chemistry
• Substitution cipher in cryptography
• Substitution rule in calculus
• Variable substitution method in lambda calculus and mathematical logic
• Import substitution in trade
• Substitute good in consumer theory
• Substitution method in the testing of optical fiber
• Substitution property of equality in mathematics
• Chord substitution in music
• Substitution in acting methodology
• Substitute in sport