Etymology
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contamination (n.)

early 15c., contaminacioun, "infection," from Medieval Latin contaminationem (nominative contaminatio) "a polluting, contamination, defilement," noun of action from past-participle stem of Latin contaminare "to defile, to corrupt, to deteriorate by mingling," originally "to bring into contact," from contamen "contact; pollution," from assimilated form of com "with, together" (see con-) + base of tangere "to touch" (from PIE root *tag- "to touch, handle"). Figurative sense is from c. 1620; specifically of radioactivity from 1913.

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Definitions of contamination

contamination (n.)
the state of being contaminated;
Synonyms: taint
contamination (n.)
a substance that contaminates;
Synonyms: contaminant
contamination (n.)
the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors;
Synonyms: pollution
From wordnet.princeton.edu