English
equestrianism
From equestrian + -ism.
A compound of equestrian + -ism
Proto-Indo-European *h₁eḱ-
…
Proto-Italic *ekwos ‘horse’
Latin equus ‘horse’
Latin eques ‘horseman, cavalryman, rider’
Latin equester ‘of or pertaining to equestrians/cavalry’
English equestrian
Today it means
noun The art or sport of horseriding; the skill required for it.
Language periods are conventional ranges, not dates for this word.
Etymograph / equestrianism