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Definition of a | What does a mean?

What is the definition of the word A?

Here is a list of definitions for 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
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
the basic unit of electric current adopted under the Systeme International d'Unites; "a typical household circuit carries 15 to 50 amps"
the 1st letter of the Roman alphabet
the blood group whose red cells carry the A antigen

What are the synonyms of the word A?

What is another word for A?. Here is a list of synonyms for A

ANGSTROM
ANGSTROM UNIT
A
VITAMIN A
ANTIOPHTHALMIC FACTOR
AXEROPHTHOL
DEOXYADENOSINE MONOPHOSPHATE
ADENINE
AMPERE
AMP
A
TYPE A
GROUP A

In which dictionaries does the word a exist?

English International (SOWPODS) - No

English USA (TWL 98) - No

English USA (TWL 06) - No

Collins Scrabble Words (CSW2012) - No

Collins Scrabble Words (CSW2007) - No

Words with Friends (WWF) - No

Enable1 (ENABLE1) - No

Letterpress (LETTERPRESS) - No