a meaning

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a determiner
1. used when referring to someone or something for the first time in a text or conversation; used to indicate membership of a class of people or things
  • "a man came out of the room"
  • "he is a lawyer"
A noun
1. (letter) the 1st letter of the Roman alphabet
Related: a
2. (blood_group) the blood group whose red cells carry the A antigen
Related: type_A, group_A
ampere noun
1. (current_unit) the basic unit of electric current adopted under the Systeme International d'Unites
Related: amp, A
  • "a typical household circuit carries 15 to 50 amps"
angstrom noun
1. (metric_linear_unit) a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
Related: angstrom_unit, A
vitamin_A noun
1. (fat-soluble_vitamin) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
Related: antiophthalmic_factor, axerophthol, A
deoxyadenosine_monophosphate noun
1. (nucleotide) one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
Related: A
adenine noun
1. (purine) (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
Related: A
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