subversion

Short definition from Wiktionary

Noun

1. 1
   The act of subverting; overturning; flipping from beneath.
2. 2
   The act of overthrowing a government or a ruler; dethronement.
3. 3
   The condition of being subverted.
4. 4
   A systematic attempt to overthrow a government by working from within; undermining.
5. 5
   A revision considered more similar to preceding subversions than a revision deemed a new "version" is to preceding versions.