A
WordNet
noun
(1) The blood group whose red cells carry the A antigen
(2) The 1st letter of the Roman alphabet
(3) The basic unit of electric current adopted under the Systeme International d'Unites
"A typical household circuit carries 15 to 50 amps"
(4) A metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
(5) (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
(6) One of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
(7) Any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
WiktionaryText
Etymology 1
From letter , derived from the letter .
Letter
- The first letter of the basic modern Latin alphabet.
Symbol
-
- A. Go to the store. B. Get some food. C. Return home. D. Eat.
- The hexadecimal digit for 10
- 0x0000000A
- The value is hexadecimal A0, or decimal 160.
Related terms
- Arabic
- Coptic
- Cyrillic
- Devanāgari
- Greek
- Hebrew
- Phoenician
- Syriac
Symbol
- ampere, a unit of electrical current.
- IUPAC 1-letter abbreviation for adenine
- IUPAC 1-letter abbreviation for alanine
- Symbol for the company Agilent Technologies, Inc. on the NYSE
Etymology 1
From and upper case letter and split of and upper case letter .
- upper case letter from 7th century replacement by Latin upper case letter of the Anglo-Saxon Futhorc letter , derived from Runic letter .
- upper case letter from 7th century replacement by Latin upper case ligature of the Anglo-Saxon Futhorc letter , also derived from Runic letter .
Letter
- The first letter of the English alphabet.
- Apple starts with A.
Etymology 2
From the initial position of the letter in the English alphabet. From FromSymbol
- The highest rank on any of various scales that assign letters.
- We assign each item inspected a rating from A through G, depending on various factors.
- The highest letter grade assigned (disregarding plusses and minuses).
- I was so happy to get an A on that test.
- A tone three fifths above C in the cycle of fifths; the sixth tone of the C major scale; the reference tone that occurs at exactly 440 Hz.
- Orchestras traditionally tune to a concert A.
- A blood type that has a specific antigen that aggravates the immune response in people with type B antigen in their blood. They may receive blood from type A or type O, but cannot receive blood from AB or B.
- My blood type is A negative.
- Austria
A
Etymology
From French Sign Language sign for the letter A.
Letter
- The letter A
Noun
(G1)
or
(G1-Z1)
Letter
- The first letter of the Esperanto alphabet.
Letter
- The first letter of the alphabet.
Noun
A
- The first letter of the Italian, and of the Latin alphabets