depend
Pronunciation: /dɪˈpɛnd/
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Definition of depend
verb
Origin:
late Middle English (in depend (sense 3); also in the sense 'wait or be in suspense'): from Old French dependre, from Latin dependere, from de- 'down' + pendere 'hang'
In informal use, it is quite common for the on to be dropped in sentences such as it all depends how you look at it (rather than it all depends on how you look at it), but in well-formed written English the on should be retained.