α. see seven v. and night n. and int.; also early Middle English seouen nih (south-west midlands, transmission error).
β. late Old English seofeniht, late Old English (early Middle English south-west midlands and south-western) seoueniht, early Middle English seoue nicht (south-west midlands), early Middle English seoue niht (south-west midlands), early Middle English seoueniþt (south-western), early Middle English seue nigt, early Middle English soueniȝt (south-western), early Middle English soueniht (south-west midlands and south-western), early Middle English soueniþt (south-western), early Middle English souenyȝt (south-western), Middle English sefniht, Middle English seueniȝht, Middle English seue niȝt, Middle English seue-niȝt, Middle English seueniȝt, Middle English seueniȝth, Middle English seueniht, Middle English seuenist, Middle English seuenyȝe, Middle English seuenyghte, Middle English seue-nyȝt, Middle English seuenyȝth, Middle English seuenyȝtte, Middle English seuenynt, Middle English seuenyst, Middle English seuenyth, Middle English seuenyþe, Middle English sevenyght, Middle English sevenyghte, Middle English sevenyȝt, Middle English sevenyȝth, Middle English sevenyht, Middle English sevenyth, Middle English–1500s seuenyght, Middle English–1700s sevenight, 1500s seuenight, 1500s sevenighte, 1600s seue'night, 1600s–1700s sev'night, 1900s– sevenicht (Scottish); N.E.D. (1912) also records the forms Middle English sefnight, Middle English seovenyght.
γ. late Middle English sennett (northern), late Middle English sennyȝt, late Middle English sennyt (in a late copy), late Middle English senyte, late Middle English synyght, late Middle English–1500s senyght, late Middle English–1500s (1700s–1800s English regional) sennet, late Middle English–1600s sennyght, 1500s seneyt, 1500s senighte, 1500s senyghte, 1500s– sennight, 1600s senet, 1600s senight, 1600s senith, 1600s s'ennight, 1600s sinnitt, 1600s (1800s– English regional) sennit, 1600s–1800s se'night (English regional), 1600s–1800s sen'night, 1600s– se'ennight (now archaic or regional), 1600s– se'nnight (now archaic or regional), 1700s se'enight, 1700s zenneert (English regional (Devon)), 1700s–1800s zennet (English regional (Devon)), 1800s zennett (English regional (Devon)), 1800s zennit (English regional (Dorset)), 1800s– sennat (English regional (Cumberland)), 1900s zenight (English regional (Somerset)); also Scottish pre-1700 seannight, pre-1700 senight, pre-1700 sennet, pre-1700 sinnet, pre-1700 synnycht, pre-1700 1800s se’night, 1700s se'enight, 1700s se'en night, 1800s se'enicht, 1800s se'ennicht, 1800s s'ennicht, 1900s– sennicht; N.E.D. (1912) also records a form late Middle English senit.