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subtask

noun
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

First Known Use of subtask

1912, in the meaning defined above

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The first known use of subtask was in 1912

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