Quote from Brad Steele on December 23, 2019, 10:22 am

When provisioning a list in your site definition you may find that you would want to use more than one content type in order to get all of the fields you need. This is possible by including all necessary content types in your "contentType" attribute within your list definition node. The last content type you include will be your default.

For example...

<list name="MyFancyList" noCrawl="TRUE" contentType="AkuminaLanguage,MyCustomContentType,MoreContentType"></list>