Definitions
1.nounAn act or instance of making or becoming open."He remembered fondly the Christmas morning opening of presents."
2.nounSomething that is open."A salamander darted out of an opening in the rocks."
3.nounAn act or instance of beginning."Their opening of the concert with Brass in Pocket always fires up the crowd."
4.nounSomething that is a beginning.
5.nounA vacant position, especially in an array."Are there likely to be any openings on the Supreme Court in the next four years?"
6.nounAn opportunity, as in a competitive activity.
7.nounIn mathematical morphology, the dilation of the erosion of a set.