c. 1300, "fight with a spear or lance on horseback with another knight; tilt in a tournament," from Old French joster "to joust, tilt, fight in single combat," from Vulgar Latin *iuxtare "to approach, come together, meet," originally "be next to," from Latin iuxta "beside, next to, very near," from suffixed (superlative) form of PIE root *yeug- "to join." Formerly spelled, and according to OED until modern times pronounced, "just." Related: Jousted; jouster; jousting.
"single combat with lances by riders on horseback," c. 1300, from Old French joste "a jounst, single combat" (12c., Modern French joute), from joster "fight with, engage in single combat" (see joust (v.)). The sport was popular with Anglo-Norman knights; the usual form in Middle English and Old French was plural, in reference to a series of contests and the accompanying revelry.
These early tournaments were very rough affairs, in every sense, quite unlike the chivalrous contests of later days; the rival parties fought in groups, and it was considered not only fair but commendable to hold off until you saw some of your adversaries getting tired and then to join in the attack on them; the object was not to break a lance in the most approved style, but frankly to disable as many opponents as possible for the sake of obtaining their horses, arms, and ransoms. [L.F. Salzman, "English Life in the Middle Ages," Oxford, 1950]