the time when a new building, road etc is used for the first time, or when a public event begins, especially when it involves a special ceremony
the official opening of the new theatre
the opening of the Cannes film festival
a hole or space in something
a narrow opening in the fence
3 [countable usually singular]
the beginning or first part of something
at the opening of the trial
a job that is available:
There are very few openings in scientific research.
a chance for someone to do or say something
His question left an opening for me to say exactly what I thought.
when something opens, or is opened
I was startled by the sudden opening of the door.