1 noun needriachtanas masc1 c m ugá masc4 c m uI'll do that when the necessity arisesdéanfaidh mé é sin nuair is gá domis there any necessity for this?an bhfuil aon ghá leis seo?, an bhfuil sé seo de dhíth?, an bhfuil sé seo riachtanach?I stole the food out of necessityghoid mé an bia de bharr riachtanais, ghoid mé an bia toisc nach raibh aon dul as agamI regretted the necessity of making her redundantbhí aithreachas orm go raibh orm í a ligean chun bealaigh, bhí aithreachas orm gurbh éigean dom í a ligean chun siúilit was an idea born of necessityas éigean a gineadh an smaoineamh2 noun essential item, skill or measureriachtanas masc1 c m ua basic necessity, like milkriachtanas bunúsach, ar nós bainnea car is a necessity around heretá carr riachtanach thart anseo, ní féidir déanamh gan charr thart anseo, ní féidir déanamh d'uireasa cairr thart anseo