adj.  great·er, 
great·est 1. a.  Very large in size, extent, or intensity: a great pile of rubble; a great storm.
b.  Of a larger size than other, similar forms: the great anteater.
c.  Large in quantity or number:
 A great throng awaited us. See Synonyms at 
 large.
 d.  Extensive in time or distance: a great delay; a great way off.
 2. a.  Remarkable or outstanding in magnitude, degree, or extent: a great crisis; great anticipation.
b.  Of outstanding significance or importance: a great work of art.
c.  Chief or principal: the great house on the estate.
d.  Superior in quality or character; noble: a great man who dedicated himself to helping others.
e.  Powerful; influential: one of the great nations of the West.
f.  Eminent; distinguished: a great leader.
 3.  Informal  a.  Very good; first-rate: We had a great time at the dance.
b.  Very skillful: She is great at algebra.
c.  Enthusiastic: a great lover of music.
 4.  Being one generation removed from the relative specified. Often used in combination: a great-granddaughter.
5.  Archaic   Pregnant.
 n.1. pl.   greats or   great  One that is great: a composer considered among the greats.
2.  Music  a.  A division of most pipe organs, usually containing the most powerful ranks of pipes.
b.  A similar division of other organs.
  adv. Informal  1.  Very well: got along great with the teacher.
2.  Used as an intensive with certain adjectives: a great big kiss.