Substitution

Substitution may refer to:

Arts and media

Chord substitution, swapping one chord for a related one within a chord progression
Tritone substitution, reinterpreting a chord via a new root note located an augmented fourth or diminished fifth distant from the root of the original interpretation
"Substitution" (Silversun Pickups song), 2009
"Substitution" (Purple Disco Machine and Kungs song), 2023

Base-pair substitution or point mutation, a type of mutation
Substitution reaction, where a functional group in a chemical compound is replaced by another group
Substituent, the atom or atoms that replaces those of the reactant
Substitution, a process in which an allele arises and undergoes fixation

Substitution (algebra), replacing occurrences of some symbol by a given value
Substitution (logic), a syntactic transformation on strings of symbols of a formal language
String substitution, a mapping of letters in an alphabet to languages
Substitution of a character in a string, one of the single-character edits used to define the Levenshtein distance
Substitution cipher, a method of encryption
Integration by substitution, a method for finding antiderivatives and integrals

Substitution (economics), switching between alternative consumable goods as their relative prices change
Attribute substitution, a psychological process thought to underlie a number of cognitive biases and perceptual illusions
Substitution method, a method of measuring the transmission loss of an optical fiber

Substitution (law), the replacement of a judge
Substitution (sport), where a sports team is able to change one player for another during a match
Substitution therapy or opiate replacement therapy
Import substitution industrialization, a trade and economic policy
Penal substitution, a theory of the atonement within Christian theology
Simultaneous substitution, a practice requiring Canadian television distribution companies to substitute a non-local station signal with the local signal