Janus

Janus

[jey-nuhs]
noun
1.
an ancient Roman god of doorways, of beginnings, and of the rising and setting of the sun, usually represented as having one head with two bearded faces back to back, looking in opposite directions.
2.
Astronomy. a moon of the planet Saturn, located just outside the rings.

Origin:
< Latin, special use of jānus doorway, archway, arcade

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World English Dictionary
Janus1 (ˈdʒeɪnəs)
 
n
the Roman god of doorways, passages, and bridges. In art he is depicted with two heads facing opposite ways
 
[C16: from Latin, from jānus archway]

Janus2 (ˈdʒeɪnəs)
 
n
a small inner satellite of Saturn

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Etymonline
Word Origin & History

Janus
ancient It. deity, guardian god of portals, patron of beginnings and endings, 1508, from L., lit. "gate, arched passageway," perhaps from PIE base *ei- "to go" (cf. Skt. yanah "path," O.C.S. jado "to travel"). He is shown as having two faces, one in front the other in back. His temple in Rome was closed
only in times of peace.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
Janus [(jay-nuhs)]

The Roman god of doors and gateways and hence of beginnings.

Note: Janus was pictured with two faces looking in opposite directions, one young and one old. Consequently, a hypocritical person is often called “Janus-faced.”
Note: The month of January is named after Janus.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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FOLDOC
Computing Dictionary

Janus definition


1. Distributed language with an ask/tell constraint system.
qdjanus is a Janus-to-Prolog compiler for Sicstus Prolog and jc is compiles to C.
["Janus: A Step Towards Distributed Constraint Programming", V. Saraswat et al in Logic Programming: Proc 1990 North Am Conf, S. Debray et al eds, MIT Press 1990].
["Programming in Janus", Saraswat, Kahn, and Levy].
2. W.M. Waite, U Colorado. Intermediate language, claimed as an implementation of UNCOL. Used on CDC 6600.
["Experience with the Universal Intermediate Language Janus", B.K. Haddon et al, Soft Prac & Exp 8(5):601- 616 (Sep 1978)].

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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