[ih-kwey-zhuh-nl, -shuh-]
of, using, or involving equations.
Biology. pertaining to the second or nonreductional cell division in meiosis, in which each chromosome divides into two equal parts.
Grammar. (of a sentence or predication) consisting of a subject and a complement with or without a copula: “Very interesting, those books” is an equational sentence.

1860–65; equation + -al1

equationally, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
equation (ɪˈkweɪʒən, -ʃən)
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

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Example sentences
Then, a decision procedure based on ground equational rewriting is applied.
These costs are presented in both graphical and equational forms wherever possible.
These costs are presented in both graphical and equational forms wherever possible.
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