irregularity
/ɪˌregjʊˈlærətɪ/noun
(pl. -ies)［mass noun］
1- the state or quality of being irregular不规则; 无规律; 不平整; 不规范：
there is evidence that fraud and irregularity continue on a large scale.
证据表明仍然有大量欺诈和违规现象存在。
1.1
- count noun（一般作irregularities）a thing that is irregular in form or nature不合规则的事; 不正当行为：
irregularities of the heartbeat
心律不齐
financial irregularities.
违规金融行为。
词源
Middle English: from Old French irregularite, from late Latin irregularitas, from irregularis （see IRREGULAR）.