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WordNet (r) 3.0 (2005)

n
1: (computer science) a code for information exchange between computers made by different companies; a string of 7 binary digits represents each character; used in most microcomputers [syn: American Standard Code for Information Interchange, ASCII]

Merriam Webster's

noun Etymology: American Standard Code for Information Interchange Date: 1963 a code for representing alphanumeric information

Britannica Concise

Standard data-transmission code used to represent both text (letters, numbers, punctuation marks) and noninput device commands (control characters). It converts information into standardized digital formats that allow computers to communicate with each other and to process and store data efficiently. Standard ASCII uses groups of seven-digit bits, and can represent 128 characters. Extended ASCII, which uses an 8-bit encoding system, can represent 256 characters, incl. many useful characters not available in standard ASCII, such as letters with accents. Extended ASCII is the industrywide standard for encoding text on personal computers. See also EBCDIC, Unicode.

Oxford Reference Dictionary

abbr. Computing American Standard Code for Information Interchange.

Webster's 1913 Dictionary

Ascii As"ci*i, Ascians As"cians, n. pl. [L. ascii, pl. of ascius, Gr. ? without shadow; 'a priv. + ? shadow.] Persons who, at certain times of the year, have no shadow at noon; -- applied to the inhabitants of the torrid zone, who have, twice a year, a vertical sun.