1. (n.) A making equal; equal division; equality; equilibrium.

2. (n.) 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. (n.) 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.

accommodation addend adjustment antilogarithm argument balance base binomial characteristic coefficient coequality coextension combination complement congruence constant coordination correspondence cosine cotangent cube decimal denominator derivative determinant difference differential discriminate dividend divisor e equality equalization equalizing equating equilibration equilibrium equipoise equipollence equiponderance equity equivalence equivalency evening evening up evenness exponent exponential factor formula function i identity increment index integral integration justice levelness likeness matrix minuend multiple multiplier norm numerator par parallelism parameter parity permutation pi poise polynomial power proportion quaternion quotient radical radix reciprocal remainder root secant sine submultiple subtrahend symmetry tangent tensor variable vector versine