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    a - Dictionary definition and meaning for word a

    (noun) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
    Synonyms : angstrom , angstrom unit
    (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes Definition
    (noun) one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) Definition
    (noun) (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
    Synonyms : adenine
    (noun) the basic unit of electric current adopted under the Systeme International d'Unites
    Synonyms : amp , ampere
    Example Sentence
    • a typical household circuit carries 15 to 50 amps
    (noun) the 1st letter of the Roman alphabet Definition
    (noun) the blood group whose red cells carry the A antigen
    Synonyms : group a , type a
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