Definition of: opening

(ō′pən·ing) noun
1. The act of becoming open or of causing to be open.
2. Something that is open; a vacant or unobstructed space, as within barriers or boundaries; a hole, passage, or gap; a space.
3. A tract in a forest where trees are lacking or thinly scattered.
4. An aperture in a wall; especially, one for the admission of light or air.
5. The first part or stage, as of a period, act, or process; a beginning; prelude.
6. In chess, checkers, etc., a specific mode of beginning the game; the series of opening moves.
7. An opportunity for action, especially in business. See synonyms under BEGINNING, BREACH, ENTRANCE¹, HOLE, OPPORTUNITY.