algorithm

noun

al·​go·​rithm ˈal-gə-ˌri-t͟həm 

: a procedure for solving a mathematical problem (as of finding the greatest common divisor) in a finite number of steps that frequently involves repetition of an operation

broadly : a step-by-step procedure for solving a problem or accomplishing some end

Each search engine has its own proprietary computation (called an "algorithm") that ranks websites for each keyword or combination of keywords.

—Julie Brinton

… sometimes you solve a problem by coming up with an algorithm of some kind. But sometimes you solve a problem in a very ad hoc sort of way.

—William H. Huggins

algorithmic

ˌal-gə-ˈrit͟h-mik 

adjective

algorithmically

ˌal-gə-ˈrit͟h-mi-k(ə-)lē 

adverb

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What Does algorithm Mean?

The current term of choice for a problem-solving procedure, algorithm, is commonly used nowadays for the set of rules a machine (and especially a computer) follows to achieve a particular goal. It does not always apply to computer-mediated activity, however. The term may as accurately be used of the steps followed in making a pizza or solving a Rubik’s Cube as for computer-powered data analysis.

Algorithm is often paired with words specifying the activity for which a set of rules have been designed. A search algorithm, for example, is a procedure that determines what kind of information is retrieved from a large mass of data. An encryption algorithm is a set of rules by which information or messages are encoded so that unauthorized persons cannot read them.

Though first attested in the early 20th century (and, until recently, used strictly as a term of mathematics and computing), algorithm has a surprisingly deep history. It was formed from algorism “the system of Arabic numerals,” a word that goes back to Middle English and ultimately stems from the name of a 9th-century Persian mathematician, abu-Jaʽfar Mohammed ibn-Mūsa al-Khuwārizmi, who did important work in the fields of algebra and numeric systems.

Examples of algorithm in a Sentence

Recent Examples on the Web

China previously stated the algorithm must remain under Chinese control by law. —Eleanor Pringle, Fortune, 29 Oct. 2025

Social media companies must conduct both counterterrorism and counternarcotics in this age, and AI algorithms can help detect them. —Ibrahim Al-Marashi, San Diego Union-Tribune, 29 Oct. 2025

Commercial company HawkEye 360 collects and processes radio frequency data from its constellation of satellites using advanced algorithms. —Literary Hub, 28 Oct. 2025

Essentially, algorithm literacy. —Sam Saideman, Rolling Stone, 28 Oct. 2025

Word History

Etymology

alteration of Middle English algorisme, from Old French & Medieval Latin; Old French, from Medieval Latin algorismus, from Arabic al-khuwārizmi, from al-Khwārizmī flourished a.d. 825 Islamic mathematician

First Known Use

1926, in the meaning defined above

Phrases Containing algorithm

• Euclidean algorithm

Rhymes for algorithm

• logarithm
• rhythm

Kids Definition

algorithm

noun

al·​go·​rithm ˈal-gə-ˌrit͟h-əm 

: a step-by-step method for solving a problem (as finding the greatest common divisor) or accomplishing a goal