Top definition
1. The nature of becoming obsolete.
2. The sound a duck makes when you beat it with a baseball bat.
The nuclear power plant led to the obsolation of the old tire burning plant. The old tire burning plant led the obsolation drive on peasant oppression. While dominating any multi-player game, bonus points will be awarded for yelling "Obsolation!" after each victory...
by Jimmy Scott Mike September 06, 2006
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