Equation

[ih-kwey-zhuh n, -shuh n] /ɪˈkweɪ ʒən, -ʃən/

noun
1.
the act of or making equal; equalization:
the symbolic equation of darkness with death.
2.
equally balanced state; equilibrium.
3.
Mathematics. an expression or a proposition, often algebraic, asserting the equality of two quantities.
4.
Also called chemical equation. Chemistry. a symbolic representation showing the kind and amount of the starting materials and products of a reaction.
/ɪˈkweɪʒən; -ʃən/
noun
1.
a mathematical statement that two expressions are equal: it is either an identity in which the variables can assume any value, or a conditional equation in which the variables have only certain values (roots)
2.
the act of regarding as equal; equating
3.
the act of making equal or balanced; equalization
4.
a situation, esp one regarded as having a number of conflicting elements: what you want doesn’t come into the equation
5.
the state of being equal, equivalent, or equally balanced
6.
a situation or problem in which a number of factors need to be considered
7.
See chemical equation
8.
(astronomy) See personal equation
n.

late 14c., a term in astrology; meaning “action of making equal” is from 1650s; mathematical sense is from 1560s, on notion of equalizing the expressions; from Latin aequationem (nominative aequatio) “an equal distribution, community,” from past participle stem of aequare (see equal (adj.)). Chemistry sense is from 1807.

equation e·qua·tion (ĭ-kwā’zhən, -shən)
n.

equation
(ĭ-kwā’zhən)

An expression of equality between two formulas in mathematics. The two formulas are written with an equal sign between them: 2 + 2 = 4 is an equation, as is E = mc2.