contamination

noun5

1. •
   The act or process of contaminating.
2. •
   Something which contaminates.
3. •
   A process whereby words with related meanings come to have similar sounds.
4. •
   The influence of one form (often from a foreign language) on the historical development of another form to which it may be related in meaning.
5. •
   The intermingling of readings from multiple sources by a copyist.