- A, a
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/ay/, n., pl. A's or As, a's or as.1. the first letter of the English alphabet, a vowel.3. something having the shape of an A.4. a written or printed representation of the letter A or a.5. a device, as a printer's type, for reproducing the letter A or a.6. from A to Z, from beginning to end; thoroughly; completely: He knows the Bible from A to Z.7. not know from A to B, to know nothing; be ignorant.
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Universalium. 2010.