What is a antonym for era?

There isn't a perfect antonym for "era" because it's a broad concept. However, depending on the context, you could use words like:

For specific time periods:

* Moment: This emphasizes a short period of time in contrast to the long duration of an era.

* Instant: Similar to "moment," this suggests a very brief period.

* Epoch: While also referring to a period of time, "epoch" often signifies a significant turning point, in contrast to the more general idea of an era.

For historical periods:

* Present: This contrasts the past, which eras typically represent.

* Future: This contrasts with the past and present, offering an opposite timeframe.

For general concepts:

* None: If you want to emphasize the absence of a specific time period or defining characteristic, you could simply use "none."

It's important to consider the context and desired meaning when choosing an antonym for "era."