Definitions from Wiktionary (irregular)

▸ adjective:  nonstandard; not conforming to rules or expectations
▸ adjective:  rough (of a surface)
▸ adjective:  without symmetry, regularity, or uniformity
▸ adjective:  (geometry, of a polygon) not regular; having sides that are not equal or angles that are not equal
▸ adjective:  (geometry, of a polyhedron) whose faces are not all regular polygons (or are not equally inclined to each other)
▸ adjective:  (grammar, of a word) not following the regular or expected patterns of inflection in a given language
▸ noun:  A soldier who is not a member of an official military force and who may not use regular army tactics.
▸ noun:  One who does not regularly attend a venue.
▸ Also see irregular

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