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opening

adjective
  1. first or beginning
    “the memorable opening bars of Beethoven's Fifth”
noun
  1. the first of a series of actions
    first step
  2. the act of opening something
    “The ray of light revealed their cautious opening of the door.”
  3. becoming open or being made open
    “The opening of the 1904 World's Fair Exposition was a sight to behold.”
  4. a recognized sequence of moves at the beginning of a game of chess
    “They memorized all the important chess openings.”
    chess opening
  5. an entrance equipped with a hatch
    hatchwayscuttle
  6. a vacant or unobstructed space that is man-made
    “they left a small opening for the cat at the bottom of the door”
  7. an aperture or hole that opens into a bodily cavity
    orificeporta
  8. a possible alternative
    possibilitypossible action
  9. the initial part of the introduction
    “the opening established the basic theme”
  10. the first performance, as of a theatrical production
    “The opening received rave reviews.”
    opening nightcurtain raising
  11. a ceremony accompanying the start of some enterprise
  12. an open or empty space in or between things
    “there was a small opening between the trees”
    gap
  13. opportunity especially for employment or promotion
    “there is an opening in the sales department”