The number obtained by raising the base (usually 10) to a power equal to a given logarithm, essentially reversing the logarithm operation.
From anti- (against, opposite) + logarithm. Created in the 17th century when logarithms were developed; the prefix anti- indicates it's the inverse mathematical operation.
John Napier invented logarithms in 1614 to make navigation and astronomy calculations faster, and antilogarithm tables became just as crucial—ship captains literally couldn't navigate without the ability to reverse these mathematical operations accurately.
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