From The Collaborative International Dictionary of English v.0.48:

Ai A"i, n.; pl. Ais. [Braz. a["i], ha["i], from the animal's cry: cf. F. a["i].] (Zool.) The three-toed sloth (Bradypus tridactylus) of South America. See Sloth. [1913 Webster] Aiblins

From WordNet (r) 2.0:

AI n 1: an agency of the United States Army responsible for providing timely and relevant and accurate and synchronized intelligence to tactical and operational and strategic level commanders [syn: Army Intelligence] 2: the branch of computer science that deal with writing computer programs that can solve problems creatively; "workers in AI hope to imitate or duplicate intelligence in computers and robots" [syn: artificial intelligence] 3: a sloth that has three long claws on each forefoot [syn: three-toed sloth, Bradypus tridactylus] 4: the introduction of semen into the oviduct or uterus by some means other than sexual intercourse [syn: artificial insemination]

From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002):

AI Adobe Illustrator (Adobe)

From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002):

AI Artificial Intelligence

From Jargon File (4.3.1, 29 Jun 2001):

AI /A-I/ n. Abbreviation for `Artificial Intelligence', so common that the full form is almost never written or spoken among hackers.

From The Free On-line Dictionary of Computing (27 SEP 03):

AI artificial intelligence

From The Free On-line Dictionary of Computing (27 SEP 03):

ai <networking> The country code for Anguilla. (1999-01-27)

From Easton's 1897 Bible Dictionary:

Ai ruins. (1.) One of the royal cities of the Canaanites (Josh. 10:1; Gen. 12:8; 13:3). It was the scene of Joshua's defeat, and afterwards of his victory. It was the second Canaanite city taken by Israel (Josh. 7:2-5; 8:1-29). It lay rebuilt and inhibited by the Benjamites (Ezra 2:28; Neh. 7:32; 11:31). It lay to the east of Bethel, "beside Beth-aven." The spot which is most probably the site of this ancient city is Haiyan, 2 miles east from Bethel. It lay up the Wady Suweinit, a steep, rugged valley, extending from the Jordan valley to Bethel. (2.) A city in the Ammonite territory (Jer. 49:3). Some have thought that the proper reading of the word is Ar (Isa. 15:1).

From Hitchcock's Bible Names Dictionary (late 1800's):

Ai, or Hai, mass; heap

From Bouvier's Law Dictionary, Revised 6th Ed (1856):

AIR. That fluid transparent substance which surrounds our globe. 2. No property can be had in the air it belongs equally to all men, being indispensable to their existence. To poison or materially to change the air, to the annoyance of the public, is a nuisance. Cro. Cr. 610; 2 Ld. Raym 1163; I Burr. 333; 1 Str. 686 Hawk. B. 1, c. 75, s. 10; Dane's Ab. Index h.t. But this must be understood with this qualification, that no one has a right to use the air over another man's land, in such a manner as to be injurious to him. See 4 Campb. 219; Bowy. Mod. Civ. Law, 62; 4 Bouv. Inst. n. 36 1; Grot. Droit de la Guerre et de la Paix, liv. 2, c. 2, Sec. 3, note, 3 et 4. 3. It is the right of the proprietor of an estate to enjoy the light and air that will come to him, and, in general, no one has a right to deprive him of them; but sometimes in building, a man opens windows over his neighbor's ground, and the latter, desirous of building on his own ground, necessarily stops the windows already built, and deprives the first builder of light and air; this he has the right to do, unless the windows are ancient lights, (q.v.) or the proprietor has acquired a right by grant or prescription to have such windows open. See Crabb on R. P. Sec. 444 to 479 and Plan. Vide Nuisance.