Logarithm

/ˈlɔːɡərɪðəm/

noun

A mathematical operation that is the reverse of exponentiation.

The base-10 logarithm of 1000 is 3, because 10 to the power of 3 equals 1000.

Technical

Definition 1 of 1

Pro Tip 1/3

The term 'logarithm' is highly specialized and mostly used in mathematics or fields that use math.

She studied the properties of logarithms in her advanced calculus class.

Pro Tip 2/3

Logarithms express precise relationships, so they aren't used for rough estimates or guesses.

Calculating the pH in chemistry requires understanding logarithms, not just estimates.

Pro Tip 3/3

The base of a logarithm changes its value; common bases are 10 (common logarithm) and e (natural logarithm).

In science, the natural logarithm (base e) is often used in growth and decay problems.

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