Inclusion is defined as the state of being included or being made a part of something.
The principle of inclusion implies actively inviting people into your environment, and consciously ensuring that your environment doesn’t exclude people because of their race, gender, disability, age, faith, gender identity, sexual orientation, caring responsibility (or another characteristic).
Structural inequality - who holds power and privilege, who things are designed for by default - means that inclusion needs to be conscious and often radical to re-dress these inequalities. It also needs to be tested, challenged and measured if it is to go beyond a buzzword towards meaningful change.