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great-aunt a sister of one's grandmother or grandfather; grandaunt.
Great Bear the constellation Ursa Major.
Great Britain the main island of the United Kingdom, off the coast of France, occupied by England, Scotland, and Wales, and including some adjacent islands. (Cf. United Kingdom.)
great calorie see calorie.
great circle a circle on a sphere that is in a plane passing through the center of the sphere. [2 definitions]
greatcoat a heavy overcoat.
Great Dane any of a breed of very large muscular short-haired dogs that have pointed ears and a square muzzle.
Great Depression the decade of the 1930s in the United States and other countries, characterized by extreme economic hardship; the Depression.
greater than in mathematics, being a quantity larger than the quantity that follows.
greater than or equal to in mathematics, being a quantity equal to or larger than the quantity that follows.
greater than or equal to sign in mathematics, a symbol (≥) indicting that the value before the sign is equal to or greater than the value after the sign.
greater than sign in mathematics, a symbol (>) indicting that the value before the sign is larger than the value after the sign.
great-grandchild a child of one's grandson or granddaughter.
great-grandfather the grandfather of a person's mother or father.
great-grandmother the grandmother of a person's mother or father.
great-grandparent a parent of one's grandmother or grandfather.
great gross a unit of quantity equal to twelve gross.
greathearted having a generous nature; magnanimous. [2 definitions]
great horned owl a large gray and brown North American owl that has two large earlike tufts of blackish feathers.
Great Lakes five large interconnected freshwater lakes on the border between the United States and Canada; Lakes Superior, Michigan, Huron, Erie, and Ontario.
great laurel a large wild rhododendron of the eastern United States that has thick glossy dark green leaves and bears clusters of white or pink flowers.