opening
noun
ˈəʊpnɪŋ 
ˈoʊpnɪŋ 
1 [countable] a space or hole that somebody/something can pass throughWe could see the stars through an opening in the roof.2 [countable, usually singular] the beginning or first part of somethingThe movie has an exciting opening.Opposite
ending3 [countable, usually singular] a ceremony to celebrate the start of a public event or the first time a new building, road, etc. is usedthe opening of the Olympic Gamesthe official opening of the new hospital4 [countable, uncountable] the act or process of making something open or of becoming openthe opening of a flowerthe opening of the new playLate opening of supermarkets is common in Britain now.Opposite
closing5 [countable] a job that is availableSynonym
vacancyThere are several openings in the sales department.6 [countable] a good opportunity for somebodyWinning the competition was the opening she needed for her career.7 [countable] part of a piece of clothing that is made to open and close so that it can be put on easilyThe skirt has a side opening.