Archaic form of decade (“period of ten years”). / Archaic form of decade (“group of ten”). / (music) A group of ten notes from which the consonant triads may be constructed

A high military officer in a warlike nation. / A local ruler or bandit leader usually where the government is weak.

Ellipsis of OVV quasar (“optically visually violent quasar”). / Abbreviation of optically violent variable. a type of quasar

(in European politics) A transnational cooperation structure, usually without political power, between contiguous territories located in different European countries.