The word that you select for this, even if you are a native speaker of English, will reveal your philosophical and political perspective on morality which varies among the speakers of a language. In other words there is no right word.
Consider the words used by moral foundations theory to describe the five or six moral foundations they have identified and promote as explanatory. The foundation that might be closest to "equality" might be "fairness/cheating", however, different political groups will have different perspectives on these words insisting they are right and their political opponents are wrong:
Fairness/cheating: This foundation is related to the evolutionary process of reciprocal altruism. It generates ideas of justice, rights, and autonomy. [Note: In our original conception, Fairness included concerns about equality, which are more strongly endorsed by political liberals. However, as we reformulated the theory in 2011 based on new data, we emphasize proportionality, which is endorsed by everyone, but is more strongly endorsed by conservatives]
Perhaps "proportionality" is most appropriate, but a native speaker may not select that word as readily as "fairness".
The other paired headings representing a positive/negative pole used to describe the other moral foundations are "care/harm", "loyalty/betrayal", "authority/subversion", "sanctity/degradation", and "liberty/oppression". Some of these other words may be appropriate as well depending on the circumstances.
Furthermore, moral foundations theory is only one perspective on morality. For a description of moral foundations theory, see Jonathan Haidt's The Righteous Mind.
Haidt, J. (2012). The righteous mind: Why good people are divided by politics and religion. Vintage. https://www.moralfoundations.org/