Present participle of equal; currently matching, reaching the same level, or making something equal to something else.
From equal (verb) + -ing (present participle). The -ing suffix is Germanic in origin and marks ongoing or continuous action.
In mathematics, we say numbers are 'equaling' each other even though technically they just 'are equal'—this linguistic quirk shows how we anthropomorphize mathematical relationships, treating equality like an active, dynamic process.
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