Mathematical statements showing that two things are equal, using numbers, letters, and symbols like an equals sign.
From Latin 'aequatio' meaning 'making equal,' derived from 'aequus' meaning 'equal.' The word entered English in the 14th century as mathematics became more formalized. It originally referred to the process of making things equal rather than the symbolic statement itself.
Equations are humanity's secret language for describing the universe—Einstein's simple equation E=mc² unlocked the mystery of atomic energy and changed everything from medicine to warfare, proving that sometimes a few symbols hold more power than thousands of words.
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