Wiktionary:Word of the day/2025/March 8

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tetration n

(arithmetic) The arithmetic operator consisting of repeated exponentiation, by analogy with exponentiation being repeated multiplication and multiplication being repeated addition, $^{b}a$ denoting $a$ to the power of $a$ to the power of $\ldots$ to the power of $a$, in which $a$ appears $b$ times. The English mathematician Reuben Goodstein, who coined the term, died on this day 40 years ago in 1985.

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