Cos'è fixed? Cos'è fixed? Firmly in position; stationary.Determined; established; set: at a fixed time; a fixed price. Not subject to change or variation; constant: pensioners on a fixed income. Chemistry Not readily evaporating; nonvolatile.Chemistry Being in a stable, combined form: fixed nitrogen. Firmly, often dogmatically held: fixed beliefs. Persistently occurring in the mind; obsessive: a fixed, delusive notion. Supplied, especially with funds or needs. Often used in combination: a well-fixed bachelor. Illegally prearranged as to outcome: a fixed election.