effectivity

noun3

1. •
   The ability or power to be effective.

   • "The extent to which the colonial people are unable to be reasonably aware of their own history and present conditions testifies to the effect and effectivity of colonial stereotype." — 2016
2. •
   A measure of the effectiveness of something.
3. •
   [Technical documentation] An indication of the product, procedure, or timescale for which an item of information is applicable or effective.