How To Spell inactivation?

Correct spelling: inactivation

What is the definition of inactivation?

  1. Rendering inactive or inert, noting, for example, the loss of activity of serum containing both ambocepter and complement when it is heated to about 55°C. (131°F.) for half an hour.

Google Ngram Viewer results for inactivation:

This graph shows how "inactivation" have occurred between 1800 and 2008 in a corpus of English books.