A mod to Half-life that is similar to Starcraft, and Aliens combined into a FPS with RTS included. Teamplay with aliens vs marines.
n00b: commander, gimme a jp/hmg now!
commander: no
n00b: eject him!
-Commander has been ejected-
by G2 July 12, 2003
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The only thing similar about Natural Selection's gameplay and Counter-Strike's is that they both involve two teams.
by Trent August 9, 2003
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1. Another name for the Columbine High School massacre.

2. Words printed on the shirt worn by Eric Harris as he committed the above.
"Sometime in April me and V will get revenge and will kick natural selection up a few notches" - Eric David Harris
by ColumbineInBloom January 15, 2005
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a game that combine rts with a fps stature. Aliens vs Marines(Kharaa (alien) and the TSA (Marines)) in the future. Great hl1 mod, dont understand the bitching about the upgrading or balancing. Its more the map placement of res towers than anything else.
I knifed 2 onos in a row today. Panoolied.
by whuh? November 14, 2004
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An incredibly ugly person that looks that they evolved in a bad way compared to the rest of man-kind
DAMN He’s ugly he looks like he got hit by natural selection.
by yourlocaldilf May 3, 2023
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1. The mod that was known to be good before 2.0

2. A mod made by Flayra, the guy who gets controlled by the fanboys and top clans

3. A mod that requires teamwork that most people don't have

4. A mod that flayra re-designedto a 6 VS 6 clanmatch games
by Anonymous October 31, 2003
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