Cavalcade belongs to one of the most productive etymological families in the Romance languages, all descended from Latin caballus ("horse"). What makes this family remarkable is that caballus was not the standard Latin word for horse — that was equus, a distinguished Indo-European term cognate with Greek hippos, Sanskrit aśva, and Old English eoh. Caballus was colloquial, possibly borrowed from a Celtic or other pre-Latin source, and originally referred to a workhorse or pack-horse. Yet it was caballus, not equus, that survived into the Romance languages: French cheval, Spanish caballo, Italian cavallo, Portuguese cavalo, Romanian cal.
From Late Latin caballicare ("to ride a horse") came Italian cavalcare ("to ride"), and from its past participle cavalcata ("a ride, a riding procession") came cavalcade via French. The word entered English in the late 16th century meaning a formal procession on horseback — a parade of riders, typically celebrating a victory, honoring a dignitary, or marking a ceremonial occasion.
The caballus family in English is vast. Cavalier (a horseman, later a supporter of Charles I), cavalry (mounted soldiers), cavalier (dismissively casual, like a haughty horseman), chivalry (from Old French chevalerie, "horsemanship, knightly conduct"), and cavalcade all trace to the same humble Latin pack-horse. The semantic range — from military horsemanship to courtly ideals to formal processions — reflects the central role of the horse in medieval European society.
A linguistic footnote with far-reaching consequences: the suffix -cade, extracted from cavalcade by English speakers who interpreted the word as caval- + -cade, has become independently productive. "Motorcade" (a procession of motor vehicles) was coined in 1912 or 1913, treating -cade as a suffix meaning "procession." This spawned "aquacade" (a water show), and the tech term "cascade" (though this actually derives independently from Italian cascata, "a falling"). The extraction of -cade from cavalcade is a textbook example of how English creates new morphemes
In modern usage, cavalcade has broadened beyond physical processions to describe any impressive sequence or succession: "a cavalcade of stars," "a cavalcade of hits," "a cavalcade of errors." The word retains connotations of grandeur and spectacle inherited from its equestrian origins.