Criticality may refer to:
Physics terms Critical phenomena, the collective name associated with the physics of critical points Critical point (thermodynamics), the end point of a phase equilibrium curve Quantum critical point, a special class of continuous phase transition that takes place at absolute zero
Nuclear-physics terms Criticality (status), the state in which a nuclear chain reaction is self-sustaining Prompt criticality, the criticality that is achieved with prompt neutrons alone Critical mass, the minimum mass of the nuclear reactor's fissionable material that can achieve criticality Criticality accident, an uncontrolled nuclear chain reaction Nuclear criticality safety, the prevention of nuclear and radiation accidents resulting from an inadvertent, self-sustaining nuclear chain reaction
Other terms Critical thinking, in education Criticality index, in risk analysis Criticality matrix, a representation (often graphical) of failure modes along with their probabilities and severities Self-organized criticality, a property of (classes of) dynamical systems which have a critical point as an attractor Critical point