The word itself has never really appealled to me- yet the meaning is so simple & profound.

in·clu·sion

1. the act of including.
2. the state of being included.
3. something that is included.

Came across this article- thought it best said what inclusion “should” mean.
http://www.disabilitytraining.com/wpblog/universal-design-for-learning-an-office-application/