∙ A gravitationally domineering celestial body with an event horizon from which even light cannot escape; the most dense material in the universe, condensed into a singularity, usually formed by a collapsing massive star.
∙ A void into which things disappear and/or from which nothing emerges. figuratively
∙ A sphere of influence into which or from which communication or similar activity is precluded.
∙ An entity which consumes time or resources without demonstrable utility.
∙ A dungeon or dark cell in a prison; a military lock-up or guardroom.
Watch example usage of "black hole"
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