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Coherence is, in general, a state or situation in which all the parts or ideas fit together well so that they form a united whole.

More specifically, coherence, coherency, or coherent may refer to the following:

Physics

Coherence (physics), an ideal property of waves that enables stationary (i.e. temporally and spatially constant) interference
Coherence (units of measurement), a derived unit that, for a given system of quantities and for a chosen set of base units, is a product of powers of base units with no other proportionality factor than one
Coherence time, the time over which a propagating wave (especially a laser or maser beam) may be considered coherent; the time interval within which its phase is, on average, predictable

Mathematics

Coherence (philosophical gambling strategy), a concept in Bayesian statistics
Coherence (signal processing), a statistic that can be used to examine the relation between two signals or data sets
Coherence (statistics), a property of self-consistency across a set of assessments, or the strength of association between two series
Coherence condition in category theory, a collection of conditions requiring that various compositions of elementary morphisms are equal
Coherency (homotopy theory) in homotopy theory and (higher) category theory
Coherent sampling, a relationship used in Fast Fourier transforms
Coherent set of characters in representation theory, a property of sets of characters that allows one to extend an isometry from the degree-zero subspace of a space of characters to the whole space
Coherent sheaf, a specific class of sheaves having particularly manageable properties closely linked to the geometrical properties of the underlying space
Mutual coherence (linear algebra), sometimes referred to as coherence, the maximum absolute value of the cross-correlations between the columns of a matrix
Multi-spectral phase coherence, a generalized nonlinear cross-frequency phase coupling metric introduced by Yang et al., 2016
Coherence (fairness), a consistency requirement of fair division rules.

Philosophy

Coherentism, philosophical theories in modern epistemology, the study of knowledge
Coherence theory of truth, a theory which regards truth as coherence within some specified set of sentences, propositions or beliefs

Computer science

Coherence (programming language), an experimental programming language based upon Subtext
Cache coherence, a special case of memory coherence
Memory coherence, a concept in computer architecture
In scrum and agile methodologies, coherence is defined as a measure of the relationships between backlog items which make them worthy of consideration as a whole.

IT products

Coherence (software), a component of Parallels Desktop for Mac, the Windows virtualization software
Coherent (operating system), a UNIX-clone operating system
Oracle Coherence, an in-memory data grid product from Oracle

Other uses

Coherence (cognitive science), a property of mental/cognitive states
Coherence (linguistics), what makes a text semantically meaningful
Coherence (music theory), a synonym for strict Rothenberg propriety in diatonic set theory
Coherent optical module, a hot-pluggable optical transceiver implementing a coherent modulation algorithm
Coherence time (communications systems), duration when a communication channel can be assumed to be constant
Coherent, Inc., a company specializing in equipment to make and measure coherent light (lasers)
Coherent risk measure in financial economics, a function that satisfies properties of monotonicity, sub-additivity, homogeneity, and translational invariance
Coherence (film), a 2013 science fiction film by James Ward Byrkit
Sense of coherence, a construct in the health theory salutogenesis
Policy coherence for development, a concept in development cooperation