Quasi-equilibrium is a term used in physics to describe a system that is almost at equilibrium but not quite there yet. It is also referred to as quasi-static equilibrium or quasi-steady-state equilibrium. Some synonyms for quasi-equilibrium include nearly steady-state, quasi-stationary, nearly balanced, almost static, and pseudo-equilibrium. These words all describe the same concept of a system in a state that is close to equilibrium but not completely stable. In thermodynamics, quasi-equilibrium is often used to describe the state of a system as it approaches equilibrium, but remains in a state of fluctuation and imperfection.