{{Wiktionarypar|cancellation}}
Cancellation can refer to
*On Mail, a Cancellation is a Postal_marking indicating that the item has been used.
*In Mathematics, cancellation is the property that if ''a'' * ''b'' = ''a'' * ''c'' then ''b'' = ''c''.
==See also==
*In Physics, Phase_cancellation refers to effect of two Waves that are out of phase with each other being summed.
*Cancelled_(South_Park) an episode of South Park.
*Noise_cancellation
{{Disambig}}