What is the noun for voluntarily?

There isn't a single noun that directly corresponds to the adverb "voluntarily." However, depending on the context, you can use several nouns to express the concept of something being done voluntarily:

* Volition: This refers to the act of making a conscious choice or decision.

* Free will: This emphasizes the absence of external compulsion or coercion.

* Choice: This highlights the ability to choose from options.

* Consent: This emphasizes the agreement or willingness to participate.

* Offer: This refers to a voluntary proposal or suggestion.

* Initiative: This highlights the act of taking action on one's own.

The best noun to use will depend on the specific situation and what aspect of "voluntarily" you want to emphasize.