• WordNet 3.6
    • adj irregular not occurring at expected times
    • adj irregular independent in behavior or thought "she led a somewhat irregular private life","maverick politicians"
    • adj irregular (of a surface or shape); not level or flat or symmetrical "walking was difficult on the irregular cobblestoned surface"
    • adj irregular lacking continuity or regularity "an irregular worker","employed on a temporary basis"
    • adj irregular deviating from normal expectations; somewhat odd, strange, or abnormal "these days large families are atypical","atypical clinical findings","atypical pneumonia","highly irregular behavior"
    • adj irregular falling below the manufacturer's standard "irregular jeans"
    • adj irregular contrary to rule or accepted order or general practice "irregular hiring practices"
    • adj irregular (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement
    • adj irregular (used of the military) not belonging to or engaged in by regular army forces "irregular troops","irregular warfare"
    • n irregular merchandise that has imperfections; usually sold at a reduced price without the brand name
    • n irregular a member of an irregular armed force that fights a stronger force by sabotage and harassment
    • ***
Webster's Revised Unabridged Dictionary
    • a Irregular Not regular; not conforming to a law, method, or usage recognized as the general rule; not according to common form; not conformable to nature, to the rules of moral rectitude, or to established principles; not normal; unnatural; immethodical; unsymmetrical; erratic; no straight; not uniform; as, an irregular line; an irregular figure; an irregular verse; an irregular physician; an irregular proceeding; irregular motion; irregular conduct, etc. Cf. Regular. "Mazes intricate,
      Eccentric, intervolved, yet regular
      Then most when most irregular they seem."
      "Leading the men of Herefordshire to fight
      Against the irregular and wild Glendower."
      "A flowery meadow through which a clear stream murmured in many irregular meanders."
    • n Irregular One who is not regular; especially, a soldier not in regular service.
    • ***
Century Dictionary and Cyclopedia
    • irregular Not regular; lacking regularity or method in some respect; not conformable to rule, order, symmetry, uniformity, or a fixed principle; deviating from the normal or usual course or state; devious; unmethodical; uneven: as, an irregular figure, outline, or surface; irregular verbs; irregular troops.
    • irregular Not regular in action or method; not conformed or conforming to regular rules or principles; hence, disorderly; lawless; improper: as, he is given to irregular courses.
    • irregular Specifically In human anatomy, being of no determinate shape, as a vertebra: said only of bones. Bones were formerly classed unnaturally in four categories, long, short, flat, and irregular. Most bones fall in the last-named category.
    • irregular In zoology: Not having a definite form; bilaterally or radially unsymmetrical; not having the form usual in a group; differing in an unusual manner from neighboring parts: as, an irregular third joint of an insect's antenna.
    • irregular Not arranged in a definite manner, or varying in position or direction: as, irregular marks (that is, marks varying in size or distance from one another); irregular punctures or striæ.
    • irregular In echinoderms, not exhibiting radial symmetry; exocyclic or petalostichous; spatangoid or clypeastroid: specifically said of the heart-urchins and other sea-urchins of the division Irregularia. See cut under petalostichous.
    • irregular In botany, not having all the members of the same part alike: said of flowers. An irregular flower is one in which the members of some or all of its floral circles—for example, petals—differ from one another in size, shape, or extent of union, as in the bean, the violet, and the larkspur. The term is also used less specifically, and is often not discriminated from unsymmetrical.
    • n irregular One who is not subject or does not conform to established regulations; especially, a soldier who is not in regular service, or a person practising medicine without belonging to the regular profession.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Irregular ir-reg′ū-lar not according to rule: unnatural: unsystematic: vicious:
    • n Irregular a soldier not in regular service
    • adj Irregular ir-reg′ū-lar (gram.) departing from the ordinary rules in its inflection: variable: not symmetrical, without regular form—(Shak.) Irreg′ulous
    • ***


  • Willa Cather
    “The irregular and intimate quality of things made entirely by the human hand.”
  • Motto
    “Impatience is the cause of most of our irregularities and extravagances Command by obeying.”
  • Thomas Otway
    Thomas Otway
    “Clocks will go as they are set, but man, irregular man, is never constant, never certain.”
  • Ralph Waldo Emerson
    “The secret of ugliness consists not in irregularity, but in being uninteresting.”


Webster's Revised Unabridged Dictionary
Pref. ir-, not + regular,: cf. F. irrégulier,


In literature:

This irregularity, he discovered, depended upon the position of the Earth with regard to Jupiter.
"The Astronomy of Milton's 'Paradise Lost'" by Thomas Orchard
Not irregular 247 337.
"A Handbook of the English Language" by Robert Gordon Latham
Observe whether the image with a high power is clear, sharp, and free from irregular wisps of stray light.
"Pleasures of the telescope" by Garrett Serviss
If he chose to have irregular relations with women, he was capable of deciding where the danger point lay.
"Jennie Gerhardt" by Theodore Dreiser
The irregularities of the ground are thus provided against, while a suitable foundation is laid.
"Brighter Britain! (Volume 1 of 2)" by William Delisle Hay
The irregular narthex and unsymmetrical eastern side chapels are evidently not parts of an original design.
"Byzantine Churches in Constantinople" by Alexander Van Millingen
The gills are free, white, then pallid, ventricose, broadest in front, irregular.
"The Mushroom, Edible and Otherwise" by M. E. Hard
Face of a deep red colour; eruption rising from it rather flat, irregular in figure and white at summits.
"North American Medical and Surgical Journal, Vol. 2, No. 3, July, 1826" by Various
Sporangia regular and stipitate or sessile and somewhat irregular; the wall, at maturity, irregularly ruptured.
"The Myxomycetes of the Miami Valley, Ohio" by A. P. Morgan
It first appears on the leaves in small, irregular, dark brown sunken spots with a dark margin.
"Manual of American Grape-Growing" by U. P. Hedrick

In poetry:

Whatever in those climes he found
Irregular in sight or sound
Did to his mind impart
A kindred impulse, seemed allied To his own powers, and justified
The workings of his heart.
"Ruth" by William Wordsworth
This love of nature, that allures to take
Irregularity for harmony
Of larger scope than our hard measures make,
Cherish it as thy school for when on thee
The ills of life descend.
"Fragments" by George Meredith
The Japanese next to me at the bar
bites at his sake with big irregular teeth.
Behind the heavy glasses (which he wears
like an elegant suit of clothes) his eyes
are yellow as the warm wine he is drinking.
"In a Bar Near Shibuya Station, Tokyo" by Paul Engle
while he was so beastly with love for Charlotte Coquet
he skated up & down in front of her house
wishing he could, sir, die,
while being bullied & he dreamt he could fly—
during irregular verbs—them world-sought bodies
safe in the Arctic lay:
"Dream Song 11: His mother goes. The mother comes & goes." by John Berryman

In news:

49ers Coach Jim Harbaugh has minor procedure for irregular heartbeat .
Harbaugh hospitalized for irregular heartbeat .
Harbaugh undergoing 'minor procedure' for irregular heartbeat .
As I tried to determine my whereabouts, a series of irregular loud 'bangs' caught my attention.
Allen West concedes election in spite of 'incredible voting irregularities'.
SEOUL, South Korea—South Korean special prosecutors say they won't indict President Lee Myung-bak's son over alleged irregularities in funding his father's retirement home.
South Korean special prosecutors say they won't indict President Lee Myung-bak's son over alleged irregularities in funding his father's retirement home.
S outh Korean special prosecutors say they won't indict President Lee Myung-bak's son over alleged irregularities in funding his father's retirement home.
SEOUL, South Korea – South Korean special prosecutors say they won't indict President Lee Myung-bak's son over alleged irregularities in funding his father's retirement home.
CAPE TOWN, South Africa (AP) — South Africa prop Tendai Mtawarira says his rugby career is not under threat after having a medical procedure to correct an irregular heartbeat.
Jim Harbaugh was scheduled for a minor procedure to address an irregular heartbeat Thursday, prompting what players were told would be a one-day absence for their head coach.
49ers' Harbaugh has surgery for irregular heartbeat.
Harbaugh has surgery for irregular heartbeat.
Alice Cooper Guitarist Steve Hunter Hospitalized With Irregular Heartbeat.
Reds' Baker Diagnosed with Irregular Heartbeat.

In science:

It shows a relatively smooth triangular inner region and an irregular outer disk dominated by several large star forming Hα regions.
Star Formation and Tidal Encounters with the Low Surface Brightness Galaxy UGC 12695 and Companions
The magnitude of torques were found to be substantial and present for grains of various irregular shape.
Physics of Grain Alignment
We apply this approach to the irregular space plasma.
Influence of Random Irregularities on Quasi-Thermal Noise Spectrum of Plasma
Rickett B.I. Power spectrum of density irregularities in the solar wind plasma. J. Geoph. Res.
Influence of Random Irregularities on Quasi-Thermal Noise Spectrum of Plasma
We also describe how the topology of the irregular fibres varies over the moduli space.
Rational polynomials of simple type