What a great question! Inclusivity is a dynamic concept, but often means accepting and involving a person in any activity or decision without discriminating against them. An example of this would be hiring based on merit rather than other identity factors (gender, race, mental health, etc.)
Another approach would be about "choice" - does the person have a say in making certain decisions, or are the decisions being made for the person? For example, the very act of being consulted for your opinion before a decision is made is a good indicator of a healthy and inclusive working environment!
There are probably many ways to practice and show inclusion. What do you think?