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 Definition of 'a'  

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Definitions of 'a'  

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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