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Definition of ARTIFACT
a: something created by humans usually for a practical purpose; especially: an object remaining from a particular period <caves containing prehistoric artifacts>
b: something characteristic of or resulting from a particular human institution, period, trend, or individual <self-consciousness … turns out to be an artifact of our education system — Times Literary Supplement>
: a product of artificial character (as in a scientific test) due usually to extraneous (as human) agency
: a product of artificial character due to extraneous (as human) agency; specifically: a product or formation in a microscopic preparation of a fixed tissue or cell that is caused by manipulation or reagents and is not indicative of actual structural relationships
: an electrocardiographic and electroencephalographic wave that arises from sources other than the heart or brain