English
equinity
From equine + -ity.
Formed from equine + -ity
Proto-Indo-European *h₁eḱ-
…
Proto-Indo-European *h₁éḱwos ‘stallion, horse’
Proto-Italic *ekwos ‘horse’
Latin equus ‘horse’
Latin equīnus ‘of or pertaining to horses’
English equine
Today it means
noun The quality of being equine.
Language periods are conventional ranges, not dates for this word.
Etymograph / equinity