Etymology
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tamper (v.)

"meddle, interfere," 1560s, figurative use of tamper "to work in clay, etc., so as to mix it thoroughly," probably originally a variant of temper (v.), which is how it often was spelled at first. Perhaps it is a dialectal workmen's pronunciation. Related: Tampered; tampering.

tamper (n.)

"one who or that which tamps," 1864, agent noun from tamp (v.).

updated on January 14, 2014

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Definitions of tamper from WordNet
1
tamper (v.)
play around with or alter or falsify, usually secretively or dishonestly;
Someone tampered with the documents on my desk
Synonyms: fiddle / monkey
tamper (v.)
intrude in other people's affairs or business; interfere unwantedly;
Synonyms: meddle
2
tamper (n.)
a tool for tamping (e.g., for tamping tobacco into a pipe bowl or a charge into a drill hole etc.);
Synonyms: tamp / tamping bar
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.