Nonlocality

Nonlocality may refer to:
 * Action at a distance, the concept in physics of nonlocal interactions
 * Principle of locality, the opposite of action at a distance
 * Quantum nonlocality, nonlocal phenomena in quantum mechanics
 * Nonlocal Lagrangian, a type of Lagrangian (a mathematical function)
 * Nonlocal operator, which maps functions on a topological space to functions, in such a way that the value of the output function at a given point cannot be determined solely from the values of the input function in any neighbourhood of any point.