1 [tam-per]
verb (used without object)
to meddle, especially for the purpose of altering, damaging, or misusing (usually followed by with ): Someone has been tampering with the lock.
to make changes in something, especially in order to falsify (usually followed by with ): to tamper with official records.
to engage secretly or improperly in something.
to engage in underhand or corrupt dealings, especially in order to influence improperly (usually followed by with ): Any lawyer who tries to tamper with a jury should be disbarred.

1560–70; probably variant of temper (v.)

tamperer, noun
untampered, adjective

1. interfere.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tamper1 (ˈtæmpə)
1.  (usually foll by with) to interfere or meddle
2.  to use corrupt practices such as bribery or blackmail
3.  (usually foll by with) to attempt to influence or corrupt, esp by bribery: to tamper with the jury
[C16: alteration of temper (verb)]

tamper2 (ˈtæmpə)
1.  a person or thing that tamps, esp an instrument for packing down tobacco in a pipe
2.  a casing around the core of a nuclear weapon to increase its efficiency by reflecting neutrons and delaying the expansion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1567, figurative use of tamper "to work in clay, etc., so as to mix it thoroughly," probably originally a variant of temper (q.v.), which is how it was initially spelled. Perhaps it is a dialectal workmen's pronunciation. Tamperproof is recorded from 1886.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Most bore small, metal and plastic shipping seals that were affixed improperly
  or showed signs of tampering.
Ravi also faces charges of tampering with evidence, hindering his own
  apprehension, and witness tampering.
Tampering generates millions in the way of campaign contributions.
It's pretty far up on the tawdriness scale, though, and also involves possible
  witness tampering.
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