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"The way you write science fiction is: you sit down at your writing machine and you open your mind to the first thought that comes through."
- Frederik Pohl

Gate  
  A gate through spacetime to other worlds.  

As far as I know, this is the first use of the word "gate" to describe this idea.

The purple circle that came in front of the plane looked just like thatů We have seen the gate to our world opened again - I am sure of it.
From Through Purple Cloud, by Jack Williamson.
Published by Wonder Stories in 1931
Additional resources -

This idea has been used many times; I was also thinking of how Robert Heinlein used the idea of the Ramsbotham Gate from his 1955 novel Tunnel in the Sky:

Ramsbotham's discoveries eliminated the basic cause of war and solved the problem of what to do with all those dimpled babies. A hundred thousand planets were no farther away than the other side of the street. Virgin continents, raw wildernesses, fecund jungles, killing deserts, frozen tundras, and implacable mountains lay just beyond the city gates, and the human race was again going out where the street lights do not shine...

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Additional resources:
  More Ideas and Technology from Through Purple Cloud
  More Ideas and Technology by Jack Williamson
  Tech news articles related to Through Purple Cloud
  Tech news articles related to works by Jack Williamson

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