Meaning of “issue” - Learner’s Dictionary

issue

noun us uk /ˈɪʃuː/
The issue has been much discussed in the media.On the issue of education the party is united.The dispute centres on racial issues.Environmental issues concern us all.These issues need to be debated openly.
PROBLEM [ C ]

B1 an important subject or problem that people are discussing:

the issues of race and social class
political issues
Chris has raised / a very important issue.
NEWSPAPER OR MAGAZINE [ C ]

B2 the newspaper, magazine, etc that is produced on a particular day:

Have you seen the latest issue of Computer World?
at issue

most important in what is being discussed:

The point at issue is what is best for the child.
take issue (with sb/sth)

to disagree with what someone says or writes:

I would take issue with you on that.

(Definition of “issue noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)