Diversity: The variety of differences and similarities/dimensions among people (which include but are not limited to, race, gender, ability, sexual orientation, ethnicity, marital status, workgroup, national origin, profession, etc.).
Inclusion: The way in which diversity is leveraged to create a fair, equitable, healthy, and high-performing organization or community where all individuals are respected, feel engaged and motivated, and their contributions toward meeting organizational and societal goals are valued (2014 Global Diversity and Inclusion Benchmarks: Standards for Organizations around the World).
Equity: Equity, unlike the notion of equality, is not about sameness of treatment. Equity denotes fairness and justice in process and in results. Equitable outcomes often require differential treatment and resource redistribution so as to achieve a level playing field among all individuals and communities. This requires recognizing and addressing barriers to to provide opportunity for all individuals and communities to thrive. (https://www.mcgill.ca/equity/resources/definitions)