The Silver Wedding! on some pensive ear / From towers remote as sound the silvery bells, / To-day from one far unforgotten year / A silvery faint memorial music swells.
a celebration to mark the twenty-fifth anniversary of a marriage.
Расстановка переносов
a cel-e-bra-tion to mark the twen·ty-fifth an-ni-ver-sa-ry of a mar-riage