irreption
noun
ir·rep·tion
ə̇ˈrepshən
plural -s
: an act or instance of entering by stealth or inadvertence
the irreption of pseudoclassical plurals in technical language
Word History
Etymology
Late Latin irreption-, irreptio, from Latin irreptus (past participle of irrepere to creep in, from in- in- entry 2 + repere to creep) + -ion-, -io -ion