1 noun behaviouroibseisiún technical term masc1 c m u2 noun with particular thingshe has an obsession with deathtá sí róthógtha leis an mbáshis interest in it borders on obsessionis geall le galar an dúspéis atá aige annthey have an obsession about cutting coststá siad an-dírithe ar chostais a ghearradh3 noun sth you're always thinking aboutcycling was his obsessionní raibh ar a iúl ach an rothaíochtit was a childhood obsession of minerud é a raibh mé an-tógtha leis agus mé i mo leanbh