irregularity (EN)

noun

noun “irregularity”

1. a situation or occurrence that does not follow a predictable pattern or schedule
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   The bus schedule has some irregularities, so it doesn't arrive at the same time every day.
2. an act of breaking the rules
   The election was contested due to several reported irregularities at the polling stations.
3. a bump or uneven spot in the shape or layout of something
   The tailor noticed an irregularity in the stitching that caused one sleeve to be longer than the other.