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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211 Expericence is a hard teacher because she gives the test first, the lesson afterwards. 
212 There are painters who transform the sun to a yellow spot, but there are others who with the help of their art and their intelligence, transform a yellow spot into the sun.
213 What is there sadder under the sun than a day that is gone and notyhing done.
214 The important thing in life is to have a great aim, and thedetermination to attain it.
215 Education makes a people easy to lead, but difficult to drive ; easy to govern but imposible to slave.
216 The education of a man never completed until he dies.
217 A thief knows a thief as a wolf knows a wolf.
218 He who has lost his good name is a dead man among the living.
219 Life is a comedy to him who thinks and a tragedy to him who feels.
220 The people may safely be trusted to hear everything true and false, and to form a correct judgment,Were it fall to me to decide whether we should have a government without newspapers of newspapers without a government, I should not hesitate a moment to prefer the latter.
221 He who will not reason, is a bigot; he who cannot is a fool ;and he who dares not is a slave.
222 What do you expect from a pig but a grunt?
223 A fool may throw a stone into a well which a hundred wise men cannot pull out.
224 If a man will begin with certainties, he shall end in doubts, but if he will be content to begin with doubts, he shall end in certaintics.
225 Knowledge is a Treasure, but Practice is the key to it.sentence dictionary
226 He that has a full purse never lacks a friend. Even in a busy market, nobody cares to know a poor person.
227 The only secret a woman can keep is that of her age.
228 As worms are bred in a stagnant pool, so are evil thoughts in idleness.
229 A man, like a watch, is to be valued by his manner of going.
230 There is many a boy here today who looks on war as all glory, but boys, it is all hell.
231 It is a silly goose that comes to the fox's sermon.
232 Habit is habit, and not to be flung out of the window by any man, but coaxed downstairs a step a time.
233 A certain amount of care or pain or trouble is necessary for every man at all times.A ship without a ballast is unstable and will not go straight.
234 Die? I should say not, dear fellow. No Barry more would allow such a conventional thing to happen to him. John Barry more, American actor, J.
235 Bring up a raven and he'll pick out your eyes.
236 A word is no arrow, but it can pierce the heart.
237 An eye for an eye, a tooth for a tooth.
238 The three things most difficult are, to keep a secret, to forget an injury[sentencedict.com], and to make good use of labour.
239 Trust not the praise of a friend, nor the contempt of an enemy.
240 A thief is a thief, whether he steals a diamond or a cucumber.