lacunaryEnglishOxford Dictionary of Englishlacunary /ləˈkjuːn(ə)ri , ˈlakjʊn(ə)ri / ▸ adjective having gaps or missing portions: the lacunary nature of recollected experience both the index and the bibliography are lacunary. – ORIGIN mid 19th century: from lacuna + -ary2.