sub·task | \ ˈsəb-ˌtask 
\
\variants:
or sub-task
plural subtasks or sub-tasks
Definition of subtask
: a task that is part of a more complex task
… I typed up a long list of every single task and even subtask I thought it would involve, from shopping for fixtures to picking up materials to installation.— Matthew Vest
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Time Traveler for subtask
The first known use of subtask was in 1912
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