This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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adj. Of, pertaining to, or constructed using equations

In machinery, equalizing; adjusting: equivalent to differential as applied to gearing and the like.

Operating with equations: as, equational logic.

"The longer he considered them, the faster he was able to gather useful information: gaps in time, how missing components from his inbuilt equational field could be compensated for; he was, in other words, able to think abstractly."

equational box