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The first letter of the English alphabet, a vowel. Any spoken sound represented by the letter A or a, as in bake, hat, father, or small. Something having the shape of an A. A written or printed representation of the letter A or a. A device, as a printer's type, for reproducing the letter A or a. from A to Z, from beginning to end; thoroughly; completely: He knows the Bible from A to Z. not know from A to B, to know nothing; be ignorant. Are; ares. Universal affirmative. Not any particular or certain one of a class or group: a man; a chemical; a house. A certain; a particular: one at a time; two of a kind; A Miss Johnson called. Another; one typically resembling: a Cicero in eloquence; a Jonah. One (used before plural nouns that are preceded by a quantifier singular in form): a hundred men (compare hundreds of men); a dozen times (compare dozens of times). Indefinitely or nonspecifically (used with adjectives expressing number): a great many years; a few stars. One (used before a noun expressing quantity): a yard of ribbon; a score of times. Any; a single: not a one. Each; every; per: ten cents a sheet; three times a day. Pronunciation Spelling. a reduced, unstressed form of of (often written as part of a single, unhyphenated word): cloth a gold; time a day; kinda; sorta. A reduced, unstressed form of auxiliary have following some modals, as might, should, could, would, and must (usually written as part of a single, unhyphenated word): We shoulda gone. He. She. It. They. I. Electricity. ampere; amperes. Physics. angstrom. Answer. British. arterial (used with a road number to designate a major highway): Take the A525 to Ruthin. The first in order or in a series. (sometimes lowercase) (in some grading systems) a grade or mark, as in school or college, indicating the quality of a student's work as excellent or superior. (sometimes lowercase) (in some school systems) a symbol designating the first semester of a school year. Music. the sixth tone in the scale of C major or the first tone in the relative minor scale, A minor. a string, key, or pipe tuned to this tone. a written or printed note representing this tone. (in the fixed system of solmization) the sixth tone of the scale of C major, called la. the tonality having A as the tonic note. Physiology. a major blood group, usually enabling a person whose blood is of this type to donate blood to persons of group A or AB and to receive blood from persons of O or A.Compare ABO system. (sometimes lowercase) the medieval Roman numeral for 50 or

500.Compare Roman numerals. Chemistry. (formerly) argon. Chemistry, Physics. mass number. Biochemistry. adenine. alanine. Logic. universal affirmative. British. a designation for a motion picture recommended as suitable for adults.Compare AA(def
5), U(def
6), X(def
9). A proportional shoe width size, narrower than B and wider than AA. A proportional brassiere cup size, smaller than B and larger than AA. A quality rating for a corporate or municipal bond, lower than AA and higher than BBB. Angstrom. Scot. all: for a' that. A reduced form of the Old English preposition on, meaning “on,” “in,” “into,” “to,” “toward,” preserved before a noun in a prepositional phrase, forming a predicate adjective or an adverbial element (afoot; abed; ashore; aside; away), or before an adjective (afar; aloud; alow), as a moribund prefix with a verb (acknowledge), and in archaic and dialectal use before a present participle in -ing (set the bells aringing); and added to a verb stem with the force of a present participle (ablaze; agape; aglow; astride; and originally, awry). A reduced form of the Old English preposition of: akin; afresh; anew. An old point-action prefix, not referring to an act as a whole, but only to the beginning or end: She arose (rose up). They abided by their beliefs (remained faithful to the end). Variant of ab- before p and v: aperient; avert. Variant of ad-, used: (
1) before sc, sp, st (ascend) and (
2) in words of French derivation (often with the sense of increase, addition): amass. Variant of an-1 before a consonant, meaning “not,” “without”: amoral; atonal; achromatic. Atomic (used in combination): A-bomb; A-plant. Year. Before. About. Acre; acres. Active. Adjective. Alto. Ampere; amperes. Anonymous. Answer. Are; ares. Baseball. assist; assists. Year. Before. Absolute. Academy. Acre; acres. America. American. Angstrom. Answer. April. Artillery. A plural ending of nouns borrowed from Greek and Latin: phenomena; criteria; data; errata; genera. A feminine singular ending of nouns borrowed from Latin and Greek, also used in Neo-Latin coinages to Latinize bases of any origin, and as a Latin substitute for the feminine ending -ē of Greek words: anabaena; cinchona; pachysandra. An ending of personal names forming feminines from masculines: Georgia; Roberta. A suffix designating the oxide of the chemical element denoted by the stem: alumina; ceria; thoria. The first letter of the Greek alphabet (A, α). The vowel sound represented by this letter. The first; beginning. (initial capital letter) Astronomy. used to designate the brightest star in a constellation. Chemistry. one of two or more isomeric compounds. The first in a series of related items: frequently used in chemistry and physics. Chiefly British. a mark or grade corresponding to an A.Compare beta(def
8), gamma(def
9). (of an animal) having the highest rank in a dominance hierarchy: the alpha female of an elephant pack. being the most dominant, powerful, or assertive person in a particular group.See also alpha male. Alphabetical: Put the files in alpha order. Chemistry. pertaining or linked to the carbon atom closest to a particular group in an organic molecule. A·gno·lo (di Co·si·mo di Ma·ria·no) [ah-nyaw-law dee kaw-zee-maw dee mah-ryah-naw] /ˈɑ nyɔ lɔ di ˈkɔ zi mɔ di mɑˈryɑ nɔ/, 1502–72, Italian painter. The first letter and first vowel of the modern English alphabet Any of several speech sounds represented by this letter, in English as in take, bag, calm, shortage, or cobra Also called: alpha the first in a series, esp the highest grade or mark, as in an examination From A to Z from start to finish, thoroughly and in detail Used preceding a singular countable noun, if the noun is not previously specified or knowna dog; a terrible disappointment Used preceding a proper noun to indicate that a person or thing has some of the qualities of the one nameda Romeo; a Shylock Used preceding a noun or determiner of quantitya cupful; a dozen eggs; a great many; to read a lot Used preceding a noun indicating a concrete or abstract thing capable of being dividedhalf a loaf; a quarter of a minute (preceded by once, twice, several times, etc) each or every; peronce a day; fifty pence a pound A certain; oneto change policy at a stroke; a Mr Jones called (preceded by not) any at allnot a hope An informal or dialect word for have they'd a said if they'd known (usually linked to the preceding noun) an informal form of of sorta sad; a kinda waste Acceleration Are(s) (metric measure of land) Atto- Chess See algebraic notation Music a note having a frequency of 440 hertz (A above middle C) or this value multiplied or divided by any power of 2; the sixth note of the scale of C major a key, string, or pipe producing this note the major or minor key having this note as its tonic A human blood type of the ABO group, containing the A antigen (in Britain) a major arterial roadthe A3 runs from London to Portsmouth (formerly, in Britain) a film certified for viewing by anyone, but which contains material that some parents may not wish their children to see (as modifier)an A film Mass number The number 10 in hexadecimal notation Cards ace Chem argon (now superseded by Ar) Ampere(s) Also: at ampere-turn Absolute (temperature) (in circuit diagrams) ammeter Area (in combination) atomican A-bomb; an A-plant Chem affinity Biochem adenine Logic a universal affirmative categorical proposition, such as all men are mortal: often symbolized as SaPCompare E, I 2, O 1 a person whose job is in top management, or who holds a senior administrative or professional position (as modifier)an A worker See also occupation groupings Austria (international car registration) Angstrom unit Not; without; opposite toatonal; asocial On; in; towardsafoot; abed; aground; aback Literary, or archaic (used before a present participle) in the act or process ofcome a-running; go a-hunting In the condition or state ofafloat; alive; asleep Acre(s) or acreage America(n) Answer The first letter in the Greek alphabet (Α, α), a vowel transliterated as a British the highest grade or mark, as in an examination (modifier) involving or relating to helium-4 nucleian alpha particle relating to one of two or more allotropes or crystal structures of a solidalpha iron relating to one of two or more isomeric forms of a chemical compound, esp one in which a group is attached to the carbon atom to which the principal group is attached (modifier) denoting the dominant person or animal in a groupthe alpha male Il, real name Agnolo di Cosimo . 1503–72, Florentine mannerist painter Scot variants of all (foll by the genitive case of a specified constellation) usually the brightest star in a constellationAlpha Centauri Communications a code word for the letter a