Multiplicity

Multiplicity may refer to:

Arts and entertainment

Multiplicity (chemistry), multiplicity in quantum chemistry is a function of angular spin momentum
Multiplicity (informatics), a type of relationship in class diagrams for Unified Modeling Language used in software engineering
Multiplicity (mathematics), the number of times an element is repeated in a multiset
Multiplicity (software), a software application which allows a user to control two or more computers from one mouse and keyboard
Multiplicity (statistical mechanics), the number of microstates corresponding to a particular macrostate in a thermodynamic system, symbolized by the Greek letter Ω
Dissociative identity disorder, psychological condition formerly called "multiple personality disorder" where a person exhibits multiple, distinct overlapping identities
Statistical multiplicity, also known as the problem of multiple comparisons

Multiplicity (Christianity)
Multiplicity (philosophy), a philosophical concept
Multiplicity (subculture), an online subculture of people who identify as having multiple personalities, some of whom are diagnosed with dissociative identity disorder