Cancellation n. : The act, process, or result of canceling; as, the cansellation of certain words in a contract, or of the contract itself.

Cancellation n. : The operation of striking out common factors, in both the dividend and divisor.

Example:
What windspeed would force a Cancellation of take off or landing of a 747?

Taxonomy
Cancellations, delays, school, high school, Weather Closings, postings, Email Notifications, kindergarten, parochial, church, temple, clubs, preschools, zipcode, organization name, DD, early dismissals, representatives.

Defination from the web:
cancellations, and delays for organizations and businesses and offers email posting services.