tamper /ˈtæm.pə(ɹ)/verb 6noun 4forms 5 verb6 •To make unauthorized or improper alterations, sometimes causing deliberate damage; to meddle (with something).The alarm had been tampered with and didn’t go off when it should have.The election monitors found that a large number of ballots had been tampered with. •To try to influence someone, usually in an illegal or devious way; to try to deal (with someone).Prosecutors argued that he would tamper with witnesses if bail was granted. •To meddle (with something) in order to corrupt or pervert it.She therefore dissuaded Julia from attempting to tamper with the honesty of a servant who had the keys of the vaults […] — 1790 •(US, Canada) To discuss future contracts with a player, against league rules. •(no longer used) To involve oneself (in a plot, scheme, etc.).[…] he was beheaded upon the Defeat of the Conspiracy for having but thus far tampered in it. — 1716 •(no longer used) To attempt to practise or administer something (especially medicine) without sufficient knowledge or qualifications.Certainly it is a scurvy strong troublesom purge, therefore ill to be tamperd with by the unskilful […] — 1649 noun4 •A person or thing that tamps. •A tool used to tamp something down, such as tobacco in a pipe. •A railway vehicle used to tamp down ballast. •An envelope of neutron-reflecting material in a nuclear weapon, used to delay the expansion of the reacting material and thus produce a longer-lasting and more energetic explosion. formstampered · tampering · tampereth · tampers · tamperest