noun Computers.
  1. an instruction sequence in a machine or assembly language program that can be prewritten and referred to as often as needed.Compare procedure(def 4a).

Origin of subroutine

First recorded in 1945–50; sub- + routine Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for subroutine

Historical Examples of subroutine

British Dictionary definitions for subroutine


  1. a section of a computer program that is stored only once but can be used when required at several different points in the program, thus saving spaceAlso called: procedure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012