คำว่า ' equation ' ( N )
มีความหมายในภาษาไทยว่า สมการ (คณิตศาสตร์)
คำนิยามในภาษาอังกฤษ (definition) :
[n.] A making equal; equal division; equality; equilibrium.
[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.
[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.