WordNet

partially or to the extent of a half; "he was half hidden by the bushes"
one of two divisions into which some games or performances are divided: the two divisions are separated by an interval
(of siblings) related through one parent only; "a half brother"; "half sister"
consisting of one of two equivalent parts in value or quantity; "a half chicken"; "lasted a half hour"
partial; "gave me a half smile"; "he did only a half job"
the extent of something from side to side (同)breadth

PrepTutorEJDIC

〈C〉〈U〉『半分』,2分の1;約半分 / 〈U〉《時刻を表す数詞と共に用いて》『半』,30分 / 〈C〉《おもに英》(2学期制の学校での)前(後)期 / 〈C〉(競技などの)前(後)半;(野球で1イニングの)表(裏) / 〈C〉=halfback / 『半分の』 / 不十分な,中途はんぱな / 『半ば』,半分[だけ] / 半時間だけ,30分だけ / 不完全に / かなり,ほとんど
〈U〉〈C〉(幅の)『広さ』,幅,横 / 〈C〉一定の幅のもの(織物)
おや,はああ,ああ(驚き・喜び・疑い・ためらいなどを表す声)
hectare; hectares

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/03/18 23:13:47」(JST)

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In CJK (Chinese, Japanese and Korean) computing, graphic characters are traditionally classed into fullwidth (in Taiwan and Hong Kong: 全形; in CJK: 全角) and halfwidth (in Taiwan and Hong Kong: 半形; in CJK: 半角) characters. With fixed-width fonts, a halfwidth character occupies half the width of a fullwidth character, hence the name.

In the days of computer terminals and text mode computing, characters were normally laid out in a grid, often 80 columns by 24 or 25 lines. Each character was displayed as a small dot matrix, often about 8 pixels wide, and an SBCS (single byte character set) was generally used to encode characters of western languages.

For a number of practical and aesthetic reasons, Han characters would need to be twice as wide as these fixed-width SBCS characters. These "fullwidth characters" were typically encoded in a DBCS (double byte character set), although less common systems used other variable-width character sets that used more bytes per character.

Halfwidth and Fullwidth Forms is also the name of a Unicode block U+FF00–FFEF.

In Unicode

In Unicode, if a certain grapheme can be represented as either a fullwidth character or a halfwidth character, it is said to have both a fullwidth form and a halfwidth form.

Halfwidth and Fullwidth Forms is the name of Unicode block U+FF00–FFEF, the last of the Basic Multilingual Plane excepting the short Specials block at U+FFF0–FFFF.

Range U+FF01–FF5E reproduces the characters of ASCII 21 to 7E as fullwidth forms, that is, a fixed width form used in CJK computing. This is useful for typesetting Latin characters in a CJK environment. U+FF00 does not correspond to a fullwidth ASCII 20 (space character), since that role is already fulfilled by U+3000 "ideographic space."

Range U+FF65–FFDC encodes halfwidth forms of Katakana and Hangul characters – see half-width kana. Range U+FFE0–FFEE includes fullwidth and halfwidth symbols.

Chart

Halfwidth and Fullwidth Forms^[1] Unicode.org chart (PDF)
	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F
U+FF0x		！	＂	＃	＄	％	＆	＇	（	）	＊	＋	，	－	．	／
U+FF1x	０	１	２	３	４	５	６	７	８	９	：	；	＜	＝	＞	？
U+FF2x	＠	Ａ	Ｂ	Ｃ	Ｄ	Ｅ	Ｆ	Ｇ	Ｈ	Ｉ	Ｊ	Ｋ	Ｌ	Ｍ	Ｎ	Ｏ
U+FF3x	Ｐ	Ｑ	Ｒ	Ｓ	Ｔ	Ｕ	Ｖ	Ｗ	Ｘ	Ｙ	Ｚ	［	＼	］	＾	＿
U+FF4x	｀	ａ	ｂ	ｃ	ｄ	ｅ	ｆ	ｇ	ｈ	ｉ	ｊ	ｋ	ｌ	ｍ	ｎ	ｏ
U+FF5x	ｐ	ｑ	ｒ	ｓ	ｔ	ｕ	ｖ	ｗ	ｘ	ｙ	ｚ	｛	｜	｝	～	｟
U+FF6x	｠	｡	｢	｣	､	･	ｦ	ｧ	ｨ	ｩ	ｪ	ｫ	ｬ	ｭ	ｮ	ｯ
U+FF7x	ｰ	ｱ	ｲ	ｳ	ｴ	ｵ	ｶ	ｷ	ｸ	ｹ	ｺ	ｻ	ｼ	ｽ	ｾ	ｿ
U+FF8x	ﾀ	ﾁ	ﾂ	ﾃ	ﾄ	ﾅ	ﾆ	ﾇ	ﾈ	ﾉ	ﾊ	ﾋ	ﾌ	ﾍ	ﾎ	ﾏ
U+FF9x	ﾐ	ﾑ	ﾒ	ﾓ	ﾔ	ﾕ	ﾖ	ﾗ	ﾘ	ﾙ	ﾚ	ﾛ	ﾜ	ﾝ	ﾞ	ﾟ
U+FFAx	ﾠ	ﾡ	ﾢ	ﾣ	ﾤ	ﾥ	ﾦ	ﾧ	ﾨ	ﾩ	ﾪ	ﾫ	ﾬ	ﾭ	ﾮ	ﾯ
U+FFBx	ﾰ	ﾱ	ﾲ	ﾳ	ﾴ	ﾵ	ﾶ	ﾷ	ﾸ	ﾹ	ﾺ	ﾻ	ﾼ	ﾽ	ﾾ
U+FFCx			ￂ	ￃ	ￄ	ￅ	ￆ	ￇ			ￊ	ￋ	ￌ	ￍ	ￎ	ￏ
U+FFDx			ￒ	ￓ	ￔ	ￕ	ￖ	ￗ			ￚ	ￛ	ￜ
U+FFEx	￠	￡	￢	￣	￤	￥	￦		￨	￩	￪	￫	￬	￭	￮
Notes 1.^ As of Unicode version 6.1

External links

http://www.alanwood.net/unicode/halfwidth_and_fullwidth_forms.html
http://everything2.com/index.pl?node=Halfwidth%20and%20Fullwidth%20Forms
Fullwidth character converter [1]

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