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[Irish,=son], element in names derived from Irish and Scottish Gaelic patronymics. In most of these names the second element was a forename (e.g., Macdonald, in various spellings). Other names included titles or epithets (e.g., McIntosh [son of the chief]). Notions that some forms of the prefix are more typically Scottish or Irish are fallacious. Some of the names, however, have typical local distribution; thus, McLeod is Hebridean, McSweeney is especially Irish. See OO,
15th letter of the alphabet. It is a usual symbol for a mid-back, rounded vowel, rather like the first part of oi. Such a vowel was represented by omicron [Gr.,=little o], its formal and positional correspondent in the Greek alphabet.
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; namename.
Personal identifying names are found in every known culture, and they often pass from one language to another. Hence the occurrence of Native American place names throughout the United States and the occurrence among American families of names of various linguistic origins
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(computer science)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.




Early system on Ferranti Mercury. Listed in CACM 2(5):16 (May 1959).


This article is provided by FOLDOC - Free Online Dictionary of Computing (


(1) For Apple's Mac, see Mac computer.

(2) For the built-in hardware ID, see MAC address.

(3) For the network protocol layer, see MAC layer.

(4) See moves-adds-changes and mandatory access control.

(5) (Multiplexed Analog Components) A video format that was analog video and digital audio. See HD analog formats.

(6) (Mission Assurance Category) See DOD cyberspace glossary.

(7) (Medicare Administrative Contractor) See healthcare IT.

(8) (Message Authentication Code) A number computed from the contents of a text message that is used to prove the integrity of a message. The MAC is a checksum that is computed using an algorithm based on the DES or AES ciphers, which use a secret key. The MAC is then sent with the message. The recipient recomputes the MAC at the other end using the same algorithm and secret key and compares it to the one that is sent. If they are the same, it is assumed that the message has not been tampered with.

A MAC is like a digital signature, except that a secret key is used rather than a private key. Also known as the U.S. Government Standard Data Authentication Code (FIPS PUB 113). See digital signature, cryptography, DES and AES.
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References in periodicals archive ?
Mack reports it holds itself to high standards and practices and is proud of the phrase "Built Like a Mack Truck," which has become ubiquitous in signifying strength and durability.
Pol O Griofa, who plays Mack, said: "Mack thinks that Adelaide will call the wedding off once she hears he's cheated on her."
Mack responded to a written interview request with a letter, hand-written in pencil:
Judge Howard Morrison Q, said he had been told that Mack, of Mockley Close, Gentleman's Lane, Ullenhall, near Henley-in- Arden, had prostate cancer and had no more than 18 months to live.
Mrs Mack, 51, went to bed early but rose at around 1.30am and confronted her husband about a bank account he had registered in his name, the court heard.
Small- and medium-sized foreign companies account for another 5% of Mack's portfolio.
Mack doesn't want to do all the product development and debugging and then see the job shipped elsewhere for production.
Prior to contracting with August Mack, the company computerized its operations to efficiently manage data.
At several points Mack credits Paul Lawrence Rose with pointing to the antisemitism of German philosophy--certainly he agrees with Rose's verdict on the revolutionary and political use to which this philosophy was put.
That was in June, when Mack left after three years because the Credit Suisse board would not back his plan to merge with a rival such as Bank of America or Barclays.
of Montgomery., Ill., Quest Outdoor Show of Tulsa and two more companies that haven't been announced yet, said Mack's owner Marion McCollum.