<theory> A partially ordered set in which all finite subsets have a least upper bound and greatest lower bound.

This definition has been standard at least since the 1930s and probably since Dedekind worked on lattice theory in the 19th century; though he may not have used that name.

See also: complete lattice, domain theory.

(01 Apr 1999)

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<microscopy> An orderly arrangement of atoms in a material, usually thought of as an infinite series of cells forming a latticework of atoms in 3-dimensions.

(05 Aug 1998)

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