Real Dictionary

Bronze Age
a phase of some human cultures, usually after a Stone Age and before an Iron Age, characterized by bronze tools and weapons, specif. such a phase in the Old World c. 3500-1000 b.c.
noun: a period of human existence marked by war and violence, following the golden and silver ages and preceding the iron age
noun: a technological stage between the Stone and Iron Ages, beginning in the Middle East about 4500 bc and lasting in Britain from about 2000 to 500 bc, during which weapons and tools were made of bronze and there was intensive trading
proper noun: The Bronze Age was a period of time which began when people started making things from bronze about 4,000–6,000 years ago.

Bronze Age in American English
noun: a period in the history of humankind, following the Stone Age and preceding the Iron Age, during which bronze weapons and implements were used