Tamper Tam"per, v. i. [imp. & p. p. Tampered; p. pr. & vb. n. Tampering.] [A corruption of temper.] 1. To meddle; to be busy; to try little experiments; as, to tamper with a disease. 'T is dangerous tampering with a muse. --Roscommon. 2. To meddle so as to alter, injure, or vitiate a thing. 3. To deal unfairly; to practice secretly; to use bribery. Others tampered For Fleetwood, Desborough, and Lambert. --Hudibras.