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1 definition found From The Jargon File (version 4.4.7, 29 Dec 2003) [jargon]: meta bit n. The top bit of an 8-bit character, which is on in character values 128--255. Also called high bit, alt bit. Some terminals and consoles (see space-cadet keyboard) have a META shift key. Others (including, mirabile dictu, keyboards on IBM PC-class machines) have an ALT key. See also bucky bits. Historical note: although in modern usage shaped by a universe of 8-bit bytes the meta bit is invariably hex 80 (octal 0200), things were different on earlier machines with 36-bit words and 9-bit bytes. The MIT and Stanford keyboards (see space-cadet keyboard) generated hex 100 (octal 400) from their meta keys.