Definition of "contaminate"

contaminate

/kənˈtæmɪneɪt/

verb
third-person singular simple present contaminates, present participle contaminating, simple past and past participle contaminated
1. (transitive) To make something dangerous or toxic by introducing impurities or foreign matter.
2. (transitive) To soil, stain, corrupt, or infect by contact or association.
  Quotations
  Shall we now Contaminate our figures with base bribes?
  1599 (first performance), William Shakespeare, “The Tragedie of Iulius Cæsar”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene iii]
  I would neither have simplicity imposed upon, nor virtue contaminated.
  1766, [Oliver Goldsmith], The Vicar of Wakefield: […], volumes (please specify |volume=I or II), Salisbury, Wiltshire: […] B. Collins, for F[rancis] Newbery, […]; reprinted London: Elliot Stock, 1885,
  [Martin] Heidegger's repellent political beliefs do not contaminate his philosophical work.
  2014 April 12, Michael Inwood, “Martin Heidegger: the philosopher who fell for Hitler [print version: Hitler's philosopher]”, in The Daily Telegraph (Review)‎, London, page R11
3. (transitive) To make unfit for use by the introduction of unwholesome or undesirable elements.
4. To infect, often with bad objects