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Definition of A

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A

noun (n)

  • a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation (noun.quantity)
    source: wordnet30
  • any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes (noun.substance)
    source: wordnet30
  • one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) (noun.substance)
    source: wordnet30
  • (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA (noun.substance)
    Synonym: adenine
    source: wordnet30
  • the basic unit of electric current adopted under the Systeme International d'Unites (noun.quantity)
    Synonym: amp, ampere
    Example:
    A typicAl household circuit cArries 15 to 50 Amps.
    source: wordnet30
  • the 1st letter of the Roman alphabet (noun.communication)
    source: wordnet30
  • the blood group whose red cells carry the A antigen (noun.body)
    Synonym: group a, type a
    source: wordnet30

Visual Synonyms (Thesaurus)

noun

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