What do you call a crowd of people listening to lecture?

There isn't one specific, widely-used term for a crowd of people listening to a lecture. Here are some options, depending on the context:

Formal:

* Audience - This is the most common and neutral term.

* Listeners - This emphasizes their role of paying attention.

* Attendees - This is more general and includes anyone present, not just those specifically listening.

Informal:

* Crowd - This is simple and direct.

* Group - This is less formal than "audience" but still implies a shared purpose.

* Class - If the lecture is part of a formal educational setting.

You can also use descriptive phrases, like:

* A captivated audience

* A rapt group of listeners

* A packed lecture hall

The best term to use will depend on the specific situation and the tone you want to convey.