The definition of contaminate is to infect, corrupt or make impure.(verb)
An example of contaminate is to accidentally place raw chicken on the counter and not clean it up.
See contaminate in Webster's New World College Dictionary
Origin: ME contaminaten < L contaminatus, pp. of contaminare, to defile < contamen, contact, contagion < com-, together + base of tangere, to touch: see tact
See contaminate in American Heritage Dictionary 4
transitive verb con·tam·i·nated, con·tam·i·nat·ing, con·tam·i·nates
Origin: Middle English contaminaten
Origin: , from Latin contāmināre, contāmināt-; see tag- in Indo-European roots.
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