:AFJ: // /n./ Written-only abbreviation for "April Fool's
Joke". Elaborate April Fool's hoaxes are a long-established
tradition on Usenet and Internet; see {kremvax} for an example.
In fact, April Fool's Day is the *only* seasonal holiday
consistently marked by customary observances on Internet and other
hacker networks.

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

:AI-complete: /A-I k*m-pleet'/ /adj./ [MIT, Stanford: by
analogy with `NP-complete' (see {NP-})] Used to describe
problems or subproblems in AI, to indicate that the solution
presupposes a solution to the `strong AI problem' (that is, the
synthesis of a human-level intelligence). A problem that is
AI-complete is, in other words, just too hard.

Examples of AI-complete problems are `The Vision Problem'
(building a system that can see as well as a human) and `The
Natural Language Problem' (building a system that can understand
and speak a natural language as well as a human). These may appear
to be modular, but all attempts so far (1996) to solve them have
foundered on the amount of context information and `intelligence'
they seem to require. See also {gedanken}.

:AI koans: /A-I koh'anz/ /pl.n./ A series of pastiches of Zen
teaching riddles created by Danny Hillis at the MIT AI Lab around
various major figures of the Lab's culture (several are included