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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61 A disease known is half cured. 
62 Half a loaf is better then no bread.
63 Better an open enemy than a false friend.
64 A fool at forty is a fool indeed.
65 A bad compromise is better than a good lawsuit.
66 A boaster and a liar are all one.
67 Two of a trade can never agree.
68 Whom a serpent has bitten fears a lizard.
69 Two blacks don't make a white.
70 It is a long lane that has no turning.
71 Whom an adder bites, dreads a lizard.
72 Better a frank denial than unwillig compliance.
73 Jadge not a book by its cover.
74 The morning sun never lasts a day.
75 We all do fade as a leaf.
75 Sentencedict.com is a online sentence dictionary, on which you can find nice sentences for a large number of words.
76 Every brave man is a man of his word.
77 A fault denied is twice committed.
78 A lion at home, a mouse abroad.
79 Patience is a plaster for all sores.
80 One father is more than a hundred schoolmasters. George Herbert
81 A word spoken is an arrow let fly.
82 A day is a miniature of eternity.
83 Forget not that you are a man.
84 True friendship is a plant of slow growth.
85 Equivocation is first cousin to a lie.
86 A happy heart makes a blooming visage.
87 Speech shows what a man is.
88 A man without reason is a beast in season.
89 A bird may be known by its song.
90 oughta be a gentleman[sentencedict.com], since his name is William.