on
definitions
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preposition
in a position on top of or attached to something; at a particular time or placeen: in a position on top of or attached to something; at a particular time or place
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adverb
in a state of being active or connecteden: in a state of being active or connected
examples
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The book is on the table.
The book is on the table.
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The light is on.
The light is on.