epoch noun
ADJ. new | present | past | historical
VERB + EPOCH mark The dropping of the first atom bomb marked a new epoch in warfare.
PREP. during/in an/the ~ the importance of the computer in the present epoch | ~ of an epoch of great social change
PHRASES the beginning/end of an epoch
You can also check other dicts: epoch (English, 中文解释 ), wordnet sense, Collins Definition