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	{{wiktionarypar2\|A\|a}}{{AZ\|uc=A\|lc=a}}
	{{dablink\|For the indefinite article, see ]}}
	:'''''A# ''' will redirect here due to ]. See ] for it.
	:''For the band, see ]''

	The letter '''A''' is the first letter in the ]. Its name in ] is ''a'' (] {{IPA\|/eɪ/}}).

	==Usage==
	In ], the letter A by itself usually denotes the ] ({{IPA\|/æ/}}) as in ''pad'', the ] ({{IPA\|/ɑː/}}) as in ''father'', or, in concert with a later orthographic vowel, the diphthong {{IPA\|/eɪ/}} (though the pronunciation varies with the dialect) as in ''ace'' and ''major'', due to effects of the ].

	In most other languages that use the Latin alphabet, the letter A denotes either an ] ({{IPA\|/ɑ/}}), or an ] ({{IPA\|/a/}}). In the ], variants of the letter A denote various ]s. In ], capital A denotes the ] and lowercase a denotes the ].

	''A'' is the third-most common letter in English, and the second-most common in ] and ]. On average, about 3.6% of letters in English tend to be ''as,'' while the number is 6.2% in Spanish and 4% in French.<ref>{{cite web\|url=http://starbase.trincoll.edu/~crypto/resources/LetFreq.html\|title=Percentages of Letter frequencies per Thousand words\|accessdate=2006-05-01}}</ref>

	''A'' also is the English ], extended to ''an'' before a vowel. See ].

	''A-'' also is a ] that serves to negate the ] to which it is attached, such as ''a''moral, ''a''political, etc.

	==Codes for computing==
	{{Letter
	\|NATO=Alfa
	\|Morse=·–
	\|Character=A1
	\|Braille=⠁
	}}
	In ] the ] A is codepoint U+0041 and the ] a is U+0061.

	In ], A is the character used to represent decimal 10, or in ], 01010

	The ] code for capital A is 65 and for lowercase a is 97; or in ] 01000001 and 01100001, correspondingly.

	The ] code for capital A is 193 and for lowercase a is 129.

	The ]s in ] and ] are "<tt>&#65;</tt>" and "<tt>&#97;</tt>" for upper and lower case respectively.

	==Meanings for A==
	* In ] ]
	** the ] are often simply referred to as the "'''A's'''."
	** '''A''' can stand for ] or ]
	* In ],
	** A stands for a whitish-blue ] in the Morgan-Keenan system
	** A stands for a January 1 through 15 discovery, in the provisional designation of a comet (for example, ], the Great Comet of 1760) or asteroid (for example, {{mpl\|(4099) 1988 AB\|5}})
	** ''a'' is often used to denote the ] of an orbit
	* In ], A is the symbol for ] and ].
	* Brassiere ] '''A'''
	* In ]s, A is often an abbreviation for the ]s April and ].
	* In ],
	** <tt><a></tt> is the ].
	** In the Mac OS, Command-A (for All), and in Windows, Ctrl-A, and selects all the text in the document, or all the pixels of an image.
	** A sometimes represents the set of all alphabetic characters within ] patterns.
	** A: is the conventional address of the first floppy disk drive in ]-based ]s such as ].
	** A is a security division ("Verified Protection") in the ].
	* In ], a ] of '''A''' typically represents the highest score that students can achieve. This is sometimes coupled with a ]/] sign, as in '''A+''' or '''A-''', or a number, as in '''A1'''. It is occasionally a grade one level below '''A*''' (pronounced "A Star").
	* In ],
	** ] is a standard size of ].
	** A refers to the Anode, or filament, component of a ].
	* In ], the word ''a'' is an ], see ]
	* In ], -a is the adjectival/attributive ending; A is commonly an abbreviation meaning English (language).
	* In ], the letter worn by Hester Prynne marking her as an adulteress in the ] novel '']'' was an ''A''.
	* In ], ''A'' is an Italian film made in 1969; see '']''.
	* In ], A is the U.S. ] for ].
	* In ]s, the letter A is used to mark each of the ]s in a deck of ]s.
	* In ] it stands for ''annum'' (Latin for "year") and is usually used with ''Mega (Ma)'' and ''Giga (Ga)'' to indicate very long periods of time; see ].
	* In ], a- is a ] (''alpha privativum'') meaning "not" or "devoid of," used in many borrowed words in ], ] and ] (for example, amoral, asexual, arhythmic).
	* In ], A is a romanization of the ] ].
	* In ] ''A'' is a movie rating, given to those intended to be seen only by adults.
	* In ], A stands for ].
	* In ], A is a series of sizes with an ] of roughly 70% width to height, with A4 being an example popular size.
	* In ],
	**the letter A is used as a symbol for the universal affirmative proposition in the general form "all x is y." The letters I, E, and O are used respectively for the particular affirmative "some x is y," the universal negative "no x is y," and the particular negative "some x is not y." The use of these letters is generally derived from the vowels of the two ] ]s ''affirmo'' (or AIo), "I assert," and ''nego'', "I deny." The use of the symbols dates from the thirteenth century, though some authorities trace their origin to the Greek logicians.
	**In ], the symbol ∀ (an inverted letter A) is the ].
	* In ],
	**A stands for area of geometric figures.
	**A is often used as a ] meaning '']'' in ] and other positional ]s with a ] of 11 or greater,
	**] <math>\mathbb{A}</math> (�dd38 in ]) sometimes represents the ].
	**In the ], each sequence has an ID consisting of the letter A and six base 10 digits.
	* In ], '''A''' (also, '''A+''' or '''A-''') is one of the human ]s.
	* In ],
	** A is a ] or ], see ].
	** A, or "side A," refers to the top or first side of a ].
	** ''A'' is a ] band; see '']''.
	** ''A'' is an album by ]; see '']''.
	** ''A'' is an album by ]; see '']''.
	* In ], A is a ].
	* In ], most SLR cameras use A to signify aperture priority mode, where the user sets the aperture and the camera determines the shutter speed.
	* In ]: A can stand for:
	** The ] of an ].
	** The derived property of ] (upper-case A for an initial/constant accleration value; lower case a for an instantaneous acceleration variable.)
	* In ], ] is the major work of influential twentieth century author ].
	* In ], a circumscribed "A" is an ].
	* As the first letter of a ],
	** In ], A stands for ].
	* In ],
	** the NATO ] ranges below 0.25 GHz.
	* On the serial numbers of ]s, A identifies the ].
	* In the ] system of units,
	** A is the symbol for the ] or amp, the ] of ].
	** a, ], is the ] meaning 10<sup>-18</sup>
	** a is the symbol for one ], from the Latin ''annum''
	** a is also the deprecated symbol for the ], a unit of surface area equal to 100 ]s.
	* In ], '''A''' means ''to'' or ''towards''.
	* In some ], '''A''' is an abbreviation for Assists.
	** '''A''' is also a term used to signify the standard of grade a certain team is in comparison to another team of the same age. e.g. John is in the A team for soccer.
	* In ], alpha is a metaphor for the beginning/creation of time and matter. It is sometimes translated to A.
	* As a ], A is the military designation for ]+1, also known as CET or ].
	* ], A is used to describe an object shaped like the capital letter A, such as an ].

	==References==
	<references />

	==See also==
	{{Wikisource1911Enc\|A}}
	{{Commons\|A}}
	* ]
	* ]
	* <big>]</big>
	* ]
	* ]
	* ]
	* ]
	* ] (Ae)
	* ] (Aa)
	* ]
	* ]
	* ]
	* ]
	* ]
	<br clear="all" />

	{{AZsubnav}}
	{{Latin letters}}

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Revision as of 11:43, 19 October 2006