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check·box | \ ˈchek-ˌbäks 
\
\variants:
or check box
plural checkboxes or check boxes
Definition of checkbox
: a small box (as in a checklist) in which to place a check mark — see check entry 1 sense 10 to make a selection, indicate completion of a task, etc.
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Merriam-Webster unabridgedWords at Play
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Time Traveler for checkbox
The first known use of checkbox was in 1944
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