Synonym: A, adenine, amp, ampere, angstrom, angstrom unit, antiophthalmic factor, axerophthol, deoxyadenosine monophosphate, group A, letter a, type A, vitamin A. Similar words: c., e., F., ad, ah, as, at, ha. Meaning: [eɪ;ə] 
n. 1. a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation 2. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes 3. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) 4. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA 5. the basic unit of electric current adopted under the Systeme International d'Unites 6. the 1st letter of the Roman alphabet 7. the blood group whose red cells carry the A antigen.
n. 1. a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation 2. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes 3. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) 4. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA 5. the basic unit of electric current adopted under the Systeme International d'Unites 6. the 1st letter of the Roman alphabet 7. the blood group whose red cells carry the A antigen. 
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1 A fool always comes short of his reckoning. 
2 From a little spark may burst a mighty flame.
3 A horse stumbles that has four legs.
4 A house is not a home.
5 Beware of a silent dog and still water.
6 A guilty conscience needs no accuser.
7 Hope is a good breakfast, but a bad supper.
8 A good wife makes a good husband.
9 To pay a person in his own way.
10 A gloved cat catches no mice.
11 A trouble shared is a trouble halved.
12 A young man married is a man that’s marred.
13 Friends agree best at a distance.
14 You cannot judge a tree by its bark.
15 A good lawyer,(www.Sentencedict.com) an devil neighbour.
16 A fair face (but) foul heart.
17 A long dispute means that both parties are wrong.
18 It is a good workman that never blunders. (918).
19 Answer a fool according to his folly.
20 A kite will never be a good hawk.
21 Often and little eating makes a man fat.
22 Rome wasn't built in a day.
23 Hell hath no fury like a woman scorned.
24 Virtue is a jewel of great price.
25 A little of everything, nothing at all.
26 A good name keeps its luster in the dark.
27 To a boiling pot flies come not.
28 A servant is known by his master's absence.
29 A good horse cannot be of a bad colour.
30 Many a good cow hath a bad calf.