al ‧ go ‧ rith ‧ m /ˈælɡərɪð ə m/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: algorism 'algorithm' (13-19 centuries) , from Medieval Latin algorismus , from Arabic al-khuwarizmi , from al-Khuwarizmi 9th-century Persian mathematician; influenced by Greek arithmos 'number' ]
technical a set of instructions that are followed in a fixed order and used for solving a mathematical problem, making a computer program etc