Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A topological space in which every small enough neighborhood is homeomorphic to a quotient of real space by the action of a finite group.
Etymologies
Named by William Thurston. From orbit and manifold. (Wiktionary)
Examples

It has something to do with maximal supersymmetry, orbifold compactifications, CalabiYau spaces and other matters a bit beyond the scope here.

Maldecena and Lin conjecture that orbifold solutions in String Theory could decay into these soliton states as tachyons condense.

A test against some explicit orbifold calculations works.

Did Beethovenâ€™s brain really exhibit patterns of orbifold compactification of D2branes?

Another test passes: a comparison with Wilson loop vevs in a dual large N ChernSimons theory (on a Z_p orbifold of
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