Irregular

In Astronomy , an Astronomical Object whose shape or behavior varies considerably from the Archetype is called an irregular. This applies to Irregular Galaxy , Irregular Variable , Asteroid , Crater , Orbit , Planet , Moon or natural Satellite .

In Language , it is applied to a word that do not follow the most common rules of the language, such as Irregular Verb , Plural or Spelling .

In Business , Law , Politics , Science and related fields, an irregular procedure, typically called an irregularity, is an action that does not completely follow the agreed standards, though it does not violate them. By itself, a single irregularity is of little consequence, but when many irregularities occur together, they may be signs of hidden Fraud , misconduct or malfeasance. See Creative Accounting and 2004 U.S. Presidential Election Controversy And Irregularities for examples.

In Manufacturing , an irregular is a product that does not meet the accepted levels of quality, but still available for sale, typically in secondary markets at a lower price.

In Military terms, an irregular is a soldier who is not part of the official regular army, or does not follow regular army tactics. See Irregular Military .

In Medicine , anything that does not follow the expected healthy pattern may be called irregular, such as Irregular Heartbeat or irregular Menstrual Cycle .

In Mathematics , something that falls below the definition of the perfect Archetype may be called irregular, such as Irregular Prime , Polygon or Polyhedron . The Irregularity is an invariant of algebraic surfaces.

In Chess , and opening that is little used and less studied is called an Irregular Chess Opening .

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