What is the meaning of 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.
- synonyms: angstrom, angstrom unit
Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes.
- synonyms: vitamin A, antiophthalmic factor, axerophthol
One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose.
- synonyms: deoxyadenosine monophosphate
Biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA.
- synonyms: adenine
The basic unit of electric current adopted under the Systeme International d'Unites.
- usage: "a typical household circuit carries 15 to 50 amps"
- synonyms: ampere, amp
The 1st letter of the Roman alphabet.
The blood group whose red cells carry the A antigen.
- synonyms: type A, group A

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APA	WordNet. (2010). a. Retrieved September 20, 2026, from http://smartdefine.org/a/definitions/1212804
Chicago	WordNet. 2010. "a" http://smartdefine.org/a/definitions/1212804 (accessed September 20, 2026).
Harvard	WordNet 2010, a, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/a/definitions/1212804>.
MLA	WordNet. "a" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/a/definitions/1212804>

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