equinity en · NOUN
Etymology
From equine + -ity.
Meanings
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(uncountable) The quality of being equine.
Clearly, a distinction needs to be drawn between Bucephalus's being a certain horse and the equinity that I believe is true of Bucephalus. The reason is that his actual equinity is quite peculiar to him; it is not and cannot be a feature of anything else; it is essentially particular.
1991, J. K. Swindler, Weaving: An Analysis of the Constitution of Objects, page 74: