A few dictionary definitions include:

Below are a couple of videos that talk about what it means to become an adult, with some tips on how you do that. One of the main concepts of the first video is that this new way of living has no specific "game plan." You learn how to take care of yourself by making your own decisions, and if something doesn't work out, you have to regroup and try something else.
This guide is here to help you learn how to make dorm-friendly meals, how to find books on stress and anxiety relief, and even learn how to apply for financial aid. So, whether you're in the dorms, living off-campus, or still at home with your family, there is helpful information for any new adult learning how to not just survive but to thrive with what they have.