Real Dictionary

void
If you describe a situation or a feeling as a void, you mean that it seems empty because there is nothing interesting or worthwhile about it.
countable noun: You can describe a large or frightening space as a void.

void in Accounting
verb: If you void a check or an invoice, you cancel it by changing the amount to zero, while leaving the transaction still posted.

void in American English
not occupied; vacant
adjective: having no legal force or effect; not legally binding or enforceable
intransitive verb: to defecate or urinate
noun: an empty space; emptiness
transitive verb: to make ineffectual; invalidate; nullify

void in British English
to make ineffective or invalid
adjective: without contents; empty
noun: an empty space or area

void in Finance
verb: If you void a check or an invoice, you cancel it by changing the amount to zero, while leaving the transaction still posted.

void in Insurance
adjective: If a contract or official agreement is void, it is not legal and has no effect.