1.   Bobbitt argues that such changes define historical eras.

2.   A new president, Franklin D. Roosevelt, had just been elected, and his Democratic liberalism would define the era.

3.   Do styles of rock simply define an era, or does the music, in some unfathomable but powerful measure, inspire the ethos?

4.   Even some of the masters who defined the era of New York movie-crime noir are uttering, well, heresy.

5.   Fashion continues to be enamored of the techniques and materials that defined an era of supreme elegance and dressmaker details.

6.   Food scarcity may well define the era now unfolding as major producing nations struggle to feed an increasing population.

7.   For a long time now we have defined this era as the post-Cold War era.

8.   Fifty years ago, in a battle that helped define another era, the Western allies and the Soviets fought for influence in Iran.

9.   For Koolhaas the era is defined by the irrationalism of the Information Age.

10.   He certainly was dominant and defined his era.