subroutine
noun/ˈsʌbruːtiːn/
/ˈsʌbruːtiːn/
(also subprogram
(computing)/ˈsʌbprəʊɡræm/
/ˈsʌbprəʊɡræm/
)- a set of instructions which perform a task within a program
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subroutine
Definition of subroutine noun from the Oxford Advanced Learner's Dictionary