In a way that is equivalent; with equal meaning, value, or effect.
From 'equivalent' (adjective) plus the adverbial suffix '-ly', which derives from Old English 'lice' (like, in the manner of). This construction allows adjectives to modify verbs or entire clauses.
Mathematicians and programmers love this word—they use 'equivalently' to show that two completely different-looking expressions actually mean the exact same thing, which is like discovering a secret password that opens multiple doors.
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