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Dictionary definition for the word "a"
a
(noun)
7 definitions 2: a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation [syn: angstrom, angstrom unit] 3: any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes [syn: vitamin A, antiophthalmic factor, axerophthol] 4: one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) [syn: deoxyadenosine monophosphate] 5: (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA [syn: adenine] 6: the basic unit of electric current adopted under the Systeme International d'Unites; "a typical household circuit carries 15 to 50 amps" [syn: ampere, amp] 7: the 1st letter of the Roman alphabet
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