1640s, "one who calculates, a reckoner, one whose occupation is to make arithmetical calculations," agent noun from compute (v.).
Meaning "calculating machine" (of any type) is from 1897; in modern use, "programmable digital electronic device for performing mathematical or logical operations," 1945 under this name (the thing itself was described by 1937 in a theoretical sense as Turing machine). ENIAC (1946) usually is considered the first.
Computer literacy is recorded from 1970; an attempt to establish computerate (adjective, on model of literate) in this sense in the early 1980s didn't catch on. Computerese "the jargon of programmers" is from 1960, as are computerize and computerization.
WASHINGTON (AP) — A New York Congressman says the use of computers to record personal data on individuals, such as their credit background, "is just frightening to me." [news article, March 17, 1968]
Earlier words for "one who calculates" include computator (c. 1600), from Latin computator; computist (late 14c.) "one skilled in calendrical or chronological reckoning."
mid-15c., "pertaining to numbers below ten;" 1650s, "pertaining to fingers," from Latin digitalis, from digitus "finger or toe" (see digit). The numerical sense is because numerals under 10 were counted on fingers. Meaning "using numerical digits" is from 1938, especially of computers which run on data in the form of digits (opposed to analogue) after c. 1945. In reference to recording or broadcasting, from 1960.
1550s, "person who examines critically," agent noun from scan (v.). From 1927 as a type of mechanical device, at first often in television technology, by mid-20c. used of radar and radiation imaging devices; later of computer digital readers.
1995, initialism (acronym) from Digital Video Disc, later changed to Digital Versatile Disc.
Earlier this year, electronics giant Toshiba positioned the first DVD players available in the U.S. as a home entertainment unit (retail price $600). [Black Enterprise magazine, June 1997]
"device for connecting computers and electronic musical instruments," 1983, acronym for Musical Instrument Digital Interface.
also PDA, by 1992, initialism (acronym) for personal digital assistant.