The term "broadsword" is today popularly applied as a generic synonym for Medieval swords or freely used to refer for any long, wide military blade. [...] The familiar practice of using it as a word for any long, fairly wide European sword appears to have first originated with Victorian writers and collectors (in the mid 1800’s). Following the example begun by swordsmen and soldiers of the late 1600’s, 19th century writers began to describe swords of earlier ages as being "broader" than their own thinner contemporary dueling ones. Yet, the etymology of the word "broadsword" can certainly be traced. No Medieval sword, whether long or short, flat or wide, thick or tapering, was called a "broadsword" by Medieval knights and warriors. The great variety of Medieval blade styles precludes referring to any single type as a representative of a generic "broadsword". There is also so far no known reference or solid evidence for the term used in reference to Renaissance military blades from the 1500’s or early 1600’s. By time the actual term even came into use during the late 1600’s, only a fraction of the diverse forms of earlier swords were still seeing use.
It is vital to note that nowhere in the many Medieval fighting manuscripts by Masters of Defence is such a term as "broadsword" ever used (not surprisingly, no mention of the term is made in the Hispano-Italian master Pietro Monte’s encyclopedic volume on weaponry published in 1509). Nor do Renaissance masters of half a dozen nations ever mention it—and if anyone would do so, surely it would be those who at the time wrote on how to use swords. Italian fencing treatises, from Medieval times to modern, refer to "spada" (sword) whether it is a cutting sword, rapier, or sport epee. No mention is made of any equivalent term to "broadsword", or what is sometimes called "spada a lama larga" (large blade sword) in modern Italian. In German, the generic term for "sword" has always been simply "Schwert" while the fairly modern "Breitschwert" (broad bladed sword) is an extremely generic and non-historical term. Various languages also called the sword as svard, suerd, swerd, espada, esapadon, spadone, or simply epee. Similarly, there are many terms across Europe from languages other than English that simply do not translate as "broadsword".
The true "broadsword" can actually be defined as a sword with a wide, straight, double-edged blade used mostly by mounted troops from the 1700’s to 1800’s. The appearance of broadswords belongs to the late 1600’s as a distinction from civilian thrusting swords. During this time a gentleman’s blade for personal defence had become the slender small-sword descended from the rapier, whereas the military (and specifically cavalry) used wider cutting blades. These weapons are in fact a form of short cutlass. The various cage and basket hilted "mortuary" blades used by cavalry starting around the 1630’s were also in form, "broadswords" (though such forms of hilt were in use as early as 1520). Many 18th-19th century blades such as spadroons, cutlasses, Walloons, Pallasches, cavalry swords, basket-hilts and straight sabers, sabres, and sciabola were all called "broadswords" at one time and typically today this classification continues by English speaking collectors.