English dictionary

a meaning and definition

Definition and meaning of a at MeaningMonkey.org. a meaning and definition in the English Dictionary.

A noun

Definition of A (noun)

  1. 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. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
  3. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
  4. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
  5. the basic unit of electric current adopted under the Systeme International d'Unites
    • "a typical household circuit carries 15 to 50 amps"
    • synonyms: amp, ampere
  6. the 1st letter of the Roman alphabet
  7. the 1st letter of the Roman alphabet
  8. the blood group whose red cells carry the A antigen
Source: Princeton University Wordnet

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