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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241 For want of a nail the shoe was lost; for want of a shoe the horse was lost; and for want of a horse the man was lost. 
242 The moon is a moon whether it shines or not.
243 The measure of a man's real character is what he would do ifhe knew he would never be found out.
244 If you have no hand, you cannot make a fist.
245 If a jewel falls into the mire, it remains as precious as before; and though dust should ascend to heaven, its former worthlessness will not be altered.
246 A bird in the hand is worth two in the bush.
247 The tongue is but three inches long, yet it can kill a man six feet high.
248 Words and deeds are quite indifferent 23modes of the divine 24energy. Words are also action, and actions are a kind of words.
249 A friend in court is better than a penny in purse.
250 You (or One) cannot make a silk purse out of a sow's ear.
251 It is dangerous crisis when a proud heart meets with flattering lips.
252 Poverty is not a sufficient cause of disgrace, but poverty without resolution to help oneself is a disgrace.
253 A wicked book is the wickeder because it cannot repent.
254 A good name is better than a golden girdle .
255 A wanderer who is determined to reach his destination does not fear the rain.
255 Sentencedict.com is a online sentence dictionary, on which you can find good sentences for a large number of words.
256 It is madness for a sheep to treat of peace with a wolf.
257 When the oak is before the ash, then you will only get a splash; when the ash is before the oak, then you may expect a soak.
258 The sooner you treat your son as a man, the sooner he will be one. John Dryden
259 March comes in like a lion and goes out like a lamb.
260 A good book is a best friend who never turns his back upon us.
261 A man is either free or he is not. There cannot be any apprenticeship for freedom.
262 Money is a singular thing, It ranks with love as man's greatest source of joy. And with death as his greatest source of anxiety.
263 To feel that one has a place in life solves half the problem of content.
264 A woman is only a woman, but a good cigar is a smoke.
265 He is a fool who cannot be angry(sentencedict.com), but he is a wise man who will not.
266 A life without a purpose is a ship without a rudder.
267 A man is not a horse because he was born in a stable.
268 The virtue of a man ought to be measured not by his extraordinary exertions, but by his everyday conduct.
269 He who can suppress a moment's anger may prevent a day of sorrow.
270 Sincerity, a deep genuine, heart-felt sincerity, is a trait of true and noble manhood.