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in the PONS Dictionary

ir·regu·lar·ity [ɪˌregjə'lærəti] N

1. irregularity form (lack of symmetry):

irregularity of an arrangement
irregularity of prices
irregularity of a surface, terrain

2. irregularity (intermittence):

irregularity of intervals

3. irregularity form (lack of accordance):

irregularity of behaviour, conduct
irregularity of an action

4. irregularity:

irregularity (peculiarity)
irregularity of customs, practices
irregularity (impropriety) of behaviour