noun

• (countable) A collection of ordered steps that solve a mathematical problem. A precise step-by-step plan for a computational procedure that possibly begins with an input value and yields an output value in a finite number of steps.
  "Informally, an algorithm is any well-defined computational procedure that takes some value, or set of values, as input and produces some value, or set of values, as output. An algorithm is thus a sequence of computational steps that transform the input into the output."
• (loosely) A flowchart illustrating a decision-making process for human users, especially health care professionals.
  "This retrospective observational analysis evaluated BP [blood pressure] control in an entirely remote management program before and during the pandemic. A team of pharmacists, nurse practitioners, physicians, and nonlicensed navigators used an evidence‐based clinical algorithm to optimize hypertensive treatment. The algorithm was adapted during the pandemic to simplify BP control."
• (uncountable, obsolete) Calculation with Arabic numerals; algorism.
• (social media, metonymic) recommender systems and the curation of feeds