1. –noun Informal .amplifier ( def. 2 ) .Origin:

1960–65; by shortening 2.Biochemistry .a white, crystalline, water-soluble nucleotide, C 10 H 12 N 5 O 3 H2 PO 4 , obtained by the partial hydrolysis of ATP or of ribonucleicacid, yielding on hydrolysis adenine, ribose, and orthophosphoricacid.3.–noun Electricity .the strength of an electric current measured in amperes.Abbreviation: amp.Origin: 1890–95; ampere + -age4.–noun Electricity .the base SI unit of electrical current, equivalent to one coulombper second, formally defined to be the constant current which ifmaintained in two straight parallel conductors of infinite length, ofnegligible circular cross section, and placed one meter apart invacuum, would produce between these conductors a force equal to2 ×10 −7 newton per meter of length. Abbreviation: A, amp.Also, ampère. Origin: 1881; named after A. M. Ampère5.==amp.==  Electricity .1.amperage.2.ampere; amperes.