Answer:
the practice or policy of providing equal access to opportunities and resources for people who might otherwise be excluded or marginalized, such as those having physical or mental disabilities or belonging to other minority groups.
"the school promotes an attitude of tolerance and inclusiveness"
ORRR
the quality of covering or dealing with a range of subjects or areas.
"the most useful feature of the book is probably its inclusiveness"
The definition of inclusiveness is an aura or environment of letting people in and making them feel welcome. An example of inclusiveness is when you make your home a comfortable place for all of your friends, family, guests and people you meet.