Open admissions imply a school's enrollment is not competitive... https://www.bestcolleges.com/features/best-colleges-with-open-admissions/

What is Open Enrollment or Open Admissions?

Open enrollment or open admissions reduce the admission criteria to just a high school diploma or GED equivalent.  The rest of the requirements are a lot more streamlined:  a placement test, application forms and fees, proof of high school graduation, and additional English proficiency testing for international students.

Generally speaking, community colleges are open admission since their main goal is to make associate degree level education accessible for all students.  There are a few universities that follow this same philosophy as well, in addition to some veteran-friendly schools that waive strict requirements.

Because of the generous nature of these schools, there may be limited space if there are more applicants than there are seats.

Benefits of Open Enrollment

There are a lot of benefits to entering a program with open enrollment. These schools are typically more affordable than schools with more restrictive admissions policies. Getting into school can be a ruthless and cutthroat activity, but with open enrollment, a lot of that difficulty is taken away.  In a sense, you don’t have to “pay” to compete before you even get to the classroom.  When you don’t have to worry about what schools are going to reject you and what schools will accept you based on your test scores, a lot of the anxiety of university application goes away.

https://www.edsmart.org/open-admission-colleges-online/