Meaning of “opening” - Learner’s Dictionary

opening

noun [ C ] uk us /ˈəʊpənɪŋ/
HOLE

a hole or space that something or someone can pass through:

We found an opening in the fence and climbed through.
START

B2 the beginning of something:

The opening of the opera is quite dramatic.
CEREMONY

B2 a ceremony at the beginning of an event or activity:

I've been invited to the opening of the new exhibition on Tuesday.
OPPORTUNITY

a job or an opportunity to do something:

There's an opening for an editorial assistant in our department.

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