It means stability, stillness, balance, leveling, serenity, proportion, measurement, equanimity, wisdom, messury.
It is a state of equality, balance or harmony. It originates from Latin aequilibrium, formed by aequus ( "equal" ) and pound ( "balance, weights" ).
Balance: of Equis = equal and books = registration-available to the point of gravity inherent in a force g. Equipolencia of the bodies as on one or several points of support. Harmony in the horizontal direction of records in unison. Health in the stable psychosomatic diagnosis. Sobriety.