α. Old English sextegða, Old English sexteoða, Old English sexteoþegan (inflected form, transmission error), Old English sixteoða, Old English systeoða, Old English syxteoþa, Old English syxteoða, early Middle English sixteoþe (south-western), Middle English sixteþe (south-west midlands and south-western), Middle English syxstethe (Hampshire).
β. early Middle English sixtenðe, Middle English sexstenethe, Middle English sextenth, Middle English sextenþe, Middle English sixstenethe, Middle English sixtenþe, Middle English syxtenethe, Middle English 1600s sextenthe, Middle English–1500s syxtenth, Middle English–1600s sixtenth, Middle English–1600s sixtenthe, 1500s sixeteenthe, 1500s sixteenthe, 1500s syxteenth, 1500s syxteneth, 1500s syxtenneth, 1500s syxtenthe, 1500s–1600s sixeteenth, 1500s–1600s sixetenth, 1500s–1600s sixteeneth, 1500s–1600s sixtienth, 1500s– sixteenth, 1600s sixtteenth; Scottish pre-1700 sexteenth, pre-1700 sextenth, pre-1700 1700s– sixteenth, 1900s– saxteenth.
γ. Middle English sextend (Lincolnshire); Scottish pre-1700 sextend, pre-1700 sextende.
δ. 1500s sixtente; Scottish pre-1700 saxteint, pre-1700 saxtenit, pre-1700 sexteint, pre-1700 sextent, pre-1700 sextint, 1800s saxteent', 1900s– saxteent.
Also represented by the abbreviations 16th, 16th, xvith, xvith, XVIth, XVIth, and variants.