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A significant and important event, object, location, or time period . Stein's gate holds such a significance , simply because the word, onto itself means absolutely nothing, but whatever concept it is used to describe is important.

From the visual novel and anime/manga series Steins;Gate , where the term is used as a name for the ideal World Line.
" A world of equality and liberty, free of war and crime, is the steins gate for a peace activist such as myself"
by rebel_striker November 05, 2013