There is no single, standard definition of health equity. The definition offered in this article might provide a starting point for your effort. The same article references other definitions as well, so it is a good resource for understanding the scope of possibilities.
After months of research, reflection, and consultation with some of the nation’s leaders in health disparities and health equity research and policy, we landed on the following definition:
Health equity means that everyone has a fair and just opportunity to be as healthy as possible. This requires removing obstacles to health such as poverty, discrimination, and their consequences, including powerlessness and lack of access to good jobs with fair pay, quality education and housing, safe environments, and health care.
And because we wanted to ensure accountability, we added the following:
For the purposes of measurement, health equity means reducing and ultimately eliminating disparities in health and its determinants that adversely affect excluded or marginalized groups.