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1. (noun) angstrom, angstrom unit, A a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation 2. (noun) vitamin A, antiophthalmic factor, axerophthol, A any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes 3. (noun) deoxyadenosine monophosphate, A one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) 4. (noun) adenine, A (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA 5. (noun) ampere, amp, A the basic unit of electric current adopted under the Systeme International d'Unites "a typical household circuit carries 15 to 50 amps" 6. (noun) A, a the 1st letter of the Roman alphabet 7. (noun) A, type A, group A the blood group whose red cells carry the A antigen
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"a." Definitions.net. STANDS4 LLC, 2008. 4 July. 2008. http://www.definitions.net/definition/a