antilogarithm
🇺🇸
/ˌæntiˈlɔːɡərɪðəm/
🇬🇧
/ˌæntiˈlɒɡərɪðəm/
A number that, when you use it in a logarithm calculation, gives you the original number.
To find the antilogarithm of 3, you would use the inverse function of the logarithm.