An　antiring　is　a　semiring　which　is　zerosumfree　(i.e.,　a+b=0　implies　a=b=0　for　any　a,b　in　this　semiring).　In　this　paper,　we　study　the　nilpotency　of　matrices　over　commutative　antirings.　We　first　provide　some　properties　and　characterizations　of　the　nilpotent　matrices　in　terms　of　principal　permanental　minors,　main　diagonals　and　permanental　adjoint　matrices.　When　a　family　of　matrices　are　simultaneously　considered,　we　establish　some　characterizations　of　the　simultaneous　nilpotence　for　a　family　of　matrices.　©　2010　Elsevier　Inc.　All　rights　reserved.