irregular
noun/ɪˈreɡjələ(r)/
/ɪˈreɡjələr/
- a soldier who is not a member of a country’s official armyWord Originlate Middle English (in the sense ‘not conforming to rule (especially that of the Church)’): via Old French from medieval Latin irregularis, from in- ‘not’ + regularis (from regula ‘rule’).
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irregular