noun Download 🔗Share For a number x, the power to which a given base number must be raised in order to obtain x. Written \logb x. For example, \log{10} 1000 = 3 because 10^3 = 1000 and \log_2 16 = 4 because 2^4 = 16. Examples : "In mathematics class, we learned that the logarithm of 100 to the base 10 is 2, because 10 raised to the power of 2 equals 100. " math number science logic Chat with AIVocabulary GamePractice Reading