Source : Webster's Revised Unabridged Dictionary (1913)

Seven \Sev"en\, a. [OE. seven, seoven, seofen, AS. seofon,
   seofan, seofen; akin to D. zeven, OS., Goth., & OHG. sibun,
   G. sieben, Icel. sjau, sj["o], Sw. sju, Dan. syv, Lith.
   septyni, Russ. seme, W. saith, Gael. seachd, Ir. seacht, L.
   septem, Gr. ???, Skr. saptan. [root]305. Cf. {Hebdomad},
   {Heptagon}, {September}.]
   One more than six; six and one added; as, seven days make one
   week.

   {Seven sciences}. See the Note under {Science}, n., 4.

   {Seven stars} (Astron.), the Pleiades.

   {Seven wonders of the world}. See under {Wonders}.

   {Seven-year apple} (Bot.), a rubiaceous shrub ({Genipa
      clusiifolia}) growing in the West Indies; also, its edible
      fruit.

   {Seven-year vine} (Bot.), a tropical climbing plant
      ({Ipom[oe]a tuberosa}) related to the morning-glory.

Seven \Sev"en\, n.
   1. The number greater by one than six; seven units or
      objects.

            Of every beast, and bird, and insect small, Game
            sevens and pairs.                     --Milton.

   2. A symbol representing seven units, as 7, or vii.

Source : WordNet®

seven
     adj : being one more than six [syn: {7}, {vii}]

seven
     n : the cardinal number that is the sum of six and one [syn: {7},
          {VII}, {sevener}, {heptad}, {septet}]