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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31 A vaunter and a liar are near akin. 
32 Wealth is the test of a man’s character.
33 A good dog deserves a good bone.
34 A guilty conscience never feels secure.
35 Many a true word is spoken in jest.
36 A man is known by his friends.
37 Joy put heart into a man.
38 Pleasure has a sting in its tail.
39 Truth will stand without a prop.
40 Mock not a cobbler for his black thumbs.
41 No man is a hero to his valet.
42 A chain is no stronger than its weakest lining.
43 Give a lark to catch a kite.
44 It is not good to wake a sleeping lion.
45 A good beginning makes a good ending.
45 Sentencedict.com is a sentence dictionary, on which you can find excellent sentences for a large number of words.
46 A bad penny always turns up.
47 An empty hand is no lure for a hawk.
48 Virtue flies from the heart of a mercenary man.
49 Money is a good servant, but a bad master.
50 Hide one's talents in a napkin.
51 Education is a progressive discovery of our own ignorance.
52 Choose a life of action, not one of ostentation.
53 There is a small choice in rotten apples.
54 There is no rose without a thorn.
55 One false step will make a great difference.
56 Economy is itself a great income.
57 Marriage is a lottery with more blanks than prizes.
58 Nothing comes amiss to a hungry man.
59 Where there's a will there's a way.
60 A middle course is the safest.