noun a making equal; equal division; equality; equilibrium.
2. equation ·noun an expression of the condition of equality between two algebraic quantities or sets of quantities, the sign being placed between them; as, a binomial equation; a quadratic equation; an algebraic equation; a transcendental equation; an exponential equation; a logarithmic equation; a differential equation, ·etc.
3. equation ·noun a quantity to be applied in computing the mean place or other element of a celestial body; that is, any one of the several quantities to be added to, or taken from, its position as calculated on the hypothesis of a mean uniform motion, in order to find its true position as resulting from its actual and unequal motion.