Top Definition
The American Natural Selection League is a competitive league for the Half-Life 1 RTS/FPS hybrid Natural Selection. It came into being shortly after the Cyberathlete Amature League removed their Open Natural Selection division.

One need not be an American to join the ANSL, but most players and servers are in North America so there may be significant lag for European players. For Europeans there is the ENSL.
That dude just went ten and oh, he must be pro ANSL.
by tekproxy November 15, 2007

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