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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. Abbr. for “air-dried.”
2. Abbr. for access door.
3. Abbr. for area drain.
4. Abbr. for “as drawn.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.




The country code for Andorra.
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Active Directory

An advanced, hierarchical network directory service that comes with Windows servers and used for managing permissions and user access to network resources. Introduced in Windows 2000, Active Directory is a domain-based network that is structured like the Internet's Domain Naming System (DNS). Using the LDAP directory access protocol, a company's workgroups (departments, sections, offices, etc.) are assigned domain names similar to Web addresses, and any LDAP-compliant Windows, Mac, Unix or Linux client can access them.

Active Directory can function in a heterogeneous, enterprise network and encompass other directories including NDS and NIS+. Cisco supports Active Directory in its IOS router operating system. See domain-based network, LDAP, forests and trees, Internet domain name, ADSI and network directory.

banner ad

A graphic image used on websites to advertise a product or service. Banner ads, or simply "banners," are rectangles typically 468 pixels wide by 60 pixels high. They also come in other common sizes, including 460x60, 460x55 and 392x72. A much larger horizontal ad image called the "leaderboard" is 728x90, while "skyscraper ads" are narrow and vertically oriented, typically 120x600 and 160x600. See trick banner, dynamic rotation, interstitial ad, Shoshkele, SUPERSTITIAL, meta ad and impression.

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References in periodicals archive ?
Court documents said A.D. killed his victim with a knife because he told him not to talk so loud.
Ashby: Chrystal Murray, Criminal Just-Law Enforce A.D.; Florence Lauziere, Practical Nursing-Partners C.; Melissa Basnett, Nursing A.D.
Visigoths sacked Rome in 410 A.D. Which modern-day country did they control most of in 500 A.D.?
The first Polynesians arrived there around A.D. 1200, rapidly launching construction projects and carving imposing statues that they lugged all over the island, two anthropologists report in an upcoming Science.
In 106 A.D. the Roman Empire, which had long been a substantial force in the region, finally took control of the isolated city of Petra.
The founding of the city of Constantinople (modern Istanbul) in A.D. 330 to be the "second Rome" began a cultural and political division of the Roman Empire that would eventually separate the Orthodox and Catholic Churches.
We learned that the largest percentage (31%) of the A.D.'s had three years or less experience and that the smallest percentage (19%) had 16 or more years experience.
"This means that the first year of the first millennium was 1 A.D. The one-thousandth year was A.D.
It was Pope Gregory IX who decreed in 1234 A.D. that only a pope can create a saint.
Donnelly; first A.D., Newt Arnold; second A.D., Robin Oliver.
The results coincide with the accounts of native Hawaiians, recorded by 19th-century Spanish missionaries, that a single leader assumed control of at least two formerly independent communities on Maul around A.D. 1600.
to A.D. 250, achieved cultural feats comparable to those of the ensuing Classic-Maya era.