EQUATION
\ɪkwˈe͡ɪʒən], \ɪkwˈeɪʒən], \ɪ_k_w_ˈeɪ_ʒ_ə_n]\
Definitions of EQUATION
 2006  WordNet 3.0
 2011  English Dictionary Database
 2010  New Age Dictionary Database
 1913  Webster's Revised Unabridged Dictionary
 1919  The Winston Simplified Dictionary
 1920  A practical medical dictionary.
 1899  The american dictionary of the english language.
 1894  The Clarendon dictionary
 1914  Nuttall's Standard dictionary of the English language
 1874  Etymological and pronouncing dictionary of the English language
 1916  Appleton's medical dictionary
 1871  The Cabinet Dictionary of the English Language
 1790  A Complete Dictionary of the English Language
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A making equal; equal division; equality; equilibrium.

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.
By Oddity Software

A making equal; equal division; equality; equilibrium.

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.
By Noah Webster.

A proposition expressing the equality of two quantities; the act of making, or the state of being made, equal.
By William Dodge Lewis, Edgar Arthur Singer
By Stedman, Thomas Lathrop
By Daniel Lyons
By William Hand Browne, Samuel Stehman Haldeman

A making equal, or an equal division; a proposition asserting the equality of two quantities, and expressed by the sign = between them; or an expression of the same quantity in two dissimilar terms, but of equal value, as 3s. = 36d. Equation of time, the interval by which apparent time differs from mean time Equation of light, allowance to be made in determining the position of a heavenly body for the time occupied in the transmission of its light to the eye of an observer. Equation of payments, the determination of the time when a debt should be paid in full that is payable only in parts at intervals.
By Nuttall, P.Austin.

A making equal; in alg., a proposition asserting the equality of two quantities, having the sign = (equal to) placed between them.
By Stormonth, James, Phelp, P. H.

In chemistry, the notation of a process of decomposition and recomposition in the form of an algebraic formula in which the numbers of atoms of each element are the same on each side of the sign of equality. [Lat.]
By Smith Ely Jelliffe

n. A making equal, or an equal division;â€”an expression of the condition of equality between two algebraic quantities or sets of quantities, the sign = being placed between them; â€” the difference between the true and the mean place of a celestial body, or between apparent and mean time.

The investigation of a mean proportion collected from the extremities of excess and defect; in algebra, an expression of the same quantity in two dissimilar terms, but of equal value; in astronomy, the difference between the time marked by the sunâ€™s apparent motion; and that measured by its motion.
By Thomas Sheridan
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