N of n
The 'era' group
The noun refers to a period of time or a point in time. The noun group after of indicates what happens during that time.
age era hour hours life lifetime term time
The 1960s was an era of steep economic decline and Wilson's leadership seemed to stumble from crisis to crisis.
I am preparing a rota and the beach will be watched throughout the hours of darkness by two observers.
The meeting comes at a time of crisis in the current round of international trade negotiations.