Eight (āt), n. [See Ait.] An island in a river; an ait. [Obs.] "Osiers on their eights." Evelyn.

Eight, a. [AS. eahta; akin to OS. ahto, OFries. achta, D. & G. acht, OHG. ahto, Icel. ātta, Sw. åtta, Dan. otte, Goth. ahtau, Lith. asztůni, Ir. & Gael. ochd, W. wyth, Armor. eich, eiz, L. octo, Gr. 'oktw`, Skr. ash&tsdot;an. √306. Cf. Octave.] Seven and one; as, eight years.

Eight (āt), n. 1. The number greater by a unit than seven; eight units or objects.

2. A symbol representing eight units, as 8 or viii.

• The cardinal number occurring after seven and before nine. Ordinal: eighth.
  
• Describing a set or group with eight components. He works eight hours a day.
  
• (playing cards)
  
• The digit/figure 8