riachtanach

== Irish == === Alternative forms === riachdanach (obsolete) riachtánach, riachtanasach === Etymology === From riachtain +‎ -ach. === Adjective === riachtanach (genitive singular masculine riachtaigh, genitive singular feminine riachtanaí, plural riachtanacha, comparative riachtanaí) necessary, essential, needful, indispensable, requisite ==== Declension ==== ==== Related terms ==== riachtanas === Further reading === “riachtanach”, in Historical Irish Corpus, 1600–1926, Royal Irish Academy Gregory Toner, Sharon Arbuthnot, Máire Ní Mhaonaigh, Marie-Luise Theuerkauf, Dagmar Wodtko, editors (2019), “ríachtanach”, in eDIL: Electronic Dictionary of the Irish Language Dinneen, Patrick S. (1927), “riaċtanaċ”, in Foclóir Gaeḋilge agus Béarla [Irish and English Dictionary], 2nd edition, Dublin: Irish Texts Society, page 893; reprinted with additions 1996, →ISBN Ó Dónaill, Niall (1977), “riachtanach”, in Foclóir Gaeilge–Béarla [Irish–English Dictionary], Dublin: An Gúm, →ISBN