|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a fool or simpleton; ninny.|
|1.||lacking uniformity or symmetry; uneven in shape, position, arrangement, etc|
|2.||not occurring at expected or equal intervals: an irregular pulse|
|3.||differing from the normal or accepted practice or routine|
|4.||not according to established standards of behaviour; unconventional|
|5.||(of the formation, inflections, or derivations of a word) not following the usual pattern of formation in a language, as English plurals ending other than in -s or -es|
|6.||of or relating to guerrillas or volunteers not belonging to regular forces: irregular troops|
|7.||(of flowers) having any of their parts, esp petals, differing in size, shape, etc; asymmetric|
|8.||(US) (of merchandise) not up to the manufacturer's standards or specifications; flawed; imperfect|
|9.||a soldier not in a regular army|
|10.||(US) (often plural) Compare second imperfect or flawed merchandise|
irregular ir·reg·u·lar (ĭ-rěg'yə-lər)
Not straight, uniform, or symmetrical, as facial features.
Of uneven rate, occurrence, or duration, as a heartbeat.
Deviating from a type; atypical.