- Mathematical formula - A making equal; equal division; equality; equilibrium. - 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. - 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.