Nonlocality

• 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
• 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.