thirdly UK /ˈθɜːdli/US /ˈθɚdli/ adverb1 •In the third place; third in a row.And God hath set some in the Church, first Apostles, secondarily Pꝛophets, thirdly Teachers, after that miracles, then gifts of healings, helpes in gouernmẽts, diuersities of tongues. — 1611