Antonym: regularity. Similar words: regularity, irregular, irregularly, at regular intervals, regular, regularly, popularity, insularity. Meaning: [ɪ‚regjə'lærətɪ /-jʊ'l-] 
n. 1. behavior that breaches the rule or etiquette or custom or morality 2. not characterized by a fixed principle or rate; at irregular intervals 3. an irregular asymmetry in shape; an irregular spatial pattern 4. irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis.
n. 1. behavior that breaches the rule or etiquette or custom or morality 2. not characterized by a fixed principle or rate; at irregular intervals 3. an irregular asymmetry in shape; an irregular spatial pattern 4. irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis. 
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61 Furthermore, we found the magnetic declination affects the vertical drifts , and it leads to a better correlation with the irregularity occurrence with the vertical drifts for all seasons.
62 Teased fiber analysis showed an increased frequency of axonal degeneration and regeneration asas excessive myelin irregularity.
63 The result of subentry statistic shows that the main influence factors on twist irregularity are spindle speed, input speed of folded yarn and single yarn evenness.
64 Lowering the twist irregularity of cone silk is one of the research projects in silk spinning.
65 Results. Radiographs revealed degenerative changes, such as disc space narrowing and irregularity, subchondral sclerosis, osteophyte formation, and hypertrophy of vertebral endplates in all groups.
66 Road irregularity, as a stationary stochastic process, is generally illustrated by power spectral density (PSD) in frequency domain.
67 The irregularity of thermal motion and the collision of molecules are the physical foundation for the system to reach an equilibrium state and to set up a fixed statistical distribution.
68 As a consequence of this irregularity, the Soundex is not particularly well suited to spell checking in the English language.
More similar words: regularity, irregular, irregularly, at regular intervals, regular, regularly, popularity, insularity, regulate, regulator, deregulate, regulation, regulatory, deregulation, regulatory agency, clarity, hilarity, polarity, similarity, dissimilarity, jugular, angular, singular, irregardless, triangular, hexangular, singularly, secularism, popularize, irritability.