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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271 Life is just a series of trying to make up your mind. 
272 A good healthy body is worth more a crown in gold.
273 One may overcome a thousand men in battle, but he who conquers himself is the greatest victor.
274 Who will not keep a penny, shall never have many.
275 A fool may ask more questions in an hour than a wise man can answer in seven years.
276 One thorn of experience is worth a whole wilderness of warning.
277 Poison is poison though it comes in a golden cup.
278 The dog that has been beaten with a stick is afraid of its shadow.
279 The dullard's envy of brilliant men is always assuaged by the suspicion that they will come to a bad end.
280 To be conscious that you are ignorant is a great step to knowledge.
281 The secret of success in life is for a man to be ready for his opportumity when it comes.
282 If a donkey bray at you, don't bray at him.
283 A poor man who takes a rich wife has a ruler, not a wife.
284 I count religion but a children toy, and hold there is no sin but igno-rance.
285 The imnportant thing in life is to have a great aim,(www.Sentencedict.com) and the determination to attain it.
286 A book is the same today as it always was and it will never change.
287 It is a foolish sheep that makes the wolf his confessor.
288 A book is like a garden carried in the pocket.
289 The mouth of a wise man is in his heart; the heart of a fool is in his mouth.
290 It is not shame for a man to learn that which he knows not, whatever be his age.
291 A covetous man is good to none but worse to himself.
292 A willful fault has no excuse and deserves no pardon.
293 Though thy enemy seem a mouse, yet watch him like a lion.