More powerful, stronger, or more influential than something else (comparative form of mighty).
From Old English 'miht' meaning power or strength, plus the comparative suffix '-er'. The phrase 'the pen is mightier than the sword' made this word famous in literature and philosophy.
Edward Bulwer-Lytton's famous line 'the pen is mightier than the sword' from 1839 became so iconic that it literally shaped how people thought about the power of words versus violence!
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