[par-uh-lel, -luhl]
extending in the same direction, equidistant at all points, and never converging or diverging: parallel rows of trees.
having the same direction, course, nature, or tendency; corresponding; similar; analogous: Canada and the U.S. have many parallel economic interests.
(of straight lines) lying in the same plane but never meeting no matter how far extended.
(of planes) having common perpendiculars.
(of a single line, plane, etc.) equidistant from another or others (usually followed by to or with ).
Electricity. consisting of or having component parts connected in parallel: a parallel circuit.
(of two voice parts) progressing so that the interval between them remains the same.
(of a tonality or key) having the same tonic but differing in mode.
of or pertaining to the apparent or actual performance of more than one operation at a time, by the same or different devices (distinguished from serial ), as in parallel processing: Some computer systems join more than one CPU for parallel processing.
of or pertaining to the simultaneous transmission or processing of all the parts of a whole, as all the bits of a byte or all the bytes of a computer word (distinguished from serial ).
a parallel line or plane.
anything parallel or comparable in direction, course, nature, or tendency to something else.
Also called parallel of latitude. Geography.
an imaginary circle on the earth's surface formed by the intersection of a plane parallel to the plane of the equator, bearing east and west and designated in degrees of latitude north or south of the equator along the arc of any meridian.
the line representing this circle on a chart or map.
something identical or similar in essential respects; match; counterpart: a case history without a known parallel.
correspondence or analogy: These two cases have some parallel with each other.
a comparison of things as if regarded side by side.
Electricity. an arrangement of the components, as resistances, of a circuit in such a way that all positive terminals are connected to one point and all negative terminals are connected to a second point, the same voltage being applied to each component. Compare series ( def 9 ).
Fortification. a trench cut in the ground before a fortress, parallel to its defenses, for the purpose of covering a besieging force.
Printing. a pair of vertical parallel lines (‖) used as a mark for reference.
Theater. a trestle for supporting a platform (parallel top)
verb (used with object), paralleled, paralleling or (especially British) parallelled, parallelling.
to provide or show a parallel for; match.
to go or be in a parallel course, direction, etc., to: The road parallels the river.
to form a parallel to; be equivalent to; equal.
to show the identity or similarity of; compare.
to make parallel.

1540–50; < Latin parallēlus < Greek parállēlos side by side, equivalent to par- par- + állēlos one another; see allo-, else

parallelable, adjective
parallelless, adjective
parallelly, adverb
nonparallel, adjective, noun
subparallel, adjective
unparallel, adjective

2. like, alike. 10. equivalent, equal, mate, duplicate, twin, double.

2. divergent; unlike; unique. 10. opposite. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
parallel (ˈpærəˌlɛl)
adj (when postpositive, usually foll by to)
1.  separated by an equal distance at every point; never touching or intersecting: parallel walls
2.  corresponding; similar: parallel situations
3.  music
 a.  Also: consecutive (of two or more parts or melodies) moving in similar motion but keeping the same interval apart throughout: parallel fifths
 b.  denoting successive chords in which the individual notes move in parallel motion
4.  grammar denoting syntactic constructions in which the constituents of one construction correspond to those of the other
5.  computing Compare serial operating on several items of information, instructions, etc, simultaneously
6.  maths one of a set of parallel lines, planes, etc
7.  an exact likeness
8.  a comparison
9.  Also called: parallel of latitude any of the imaginary lines around the earth parallel to the equator, designated by degrees of latitude ranging from 0° at the equator to 90° at the poles
10.  a.  a configuration of two or more electrical components connected between two points in a circuit so that the same voltage is applied to each (esp in the phrase in parallel)
 b.  See series (as modifier): a parallel circuit
11.  printing the character (∥) used as a reference mark
12.  a trench or line lying in advance of and parallel to other defensive positions
vb , -lels, -leling, -leled
13.  to make parallel
14.  to supply a parallel to
15.  to be a parallel to or correspond with: your experience parallels mine
[C16: via French and Latin from Greek parallēlos alongside one another, from para-1 + allēlos one another]

paralleling (ˈpærəˌlɛliŋ)
a form of trading in which companies buy highly priced goods in a market in which the prices are low in order to be able to sell them in a market in which the prices are higher

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1540s, from M.Fr. parallèle, from L. parallelus, from Gk. parallelos "parallel," from para allelois "beside one another," from para "beside" + allelois "each other," from allos "other" (see alias). The verb is first recorded 1590s. Parallel bars as gymnastics apparatus are recorded from 1868.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
parallel   (pār'ə-lěl')  Pronunciation Key 
Adjective   Of or relating to lines or surfaces that are separated everywhere from each other by the same distance.

Noun   Any of the imaginary lines encircling the Earth's surface parallel to the plane of the equator, used to represent degrees of latitude. See illustration at longitude.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for paralleling
As such, genre sf reflected the social mores of the day, paralleling common prejudices.
A section of fissures east of the white giant formation and paralleling the bat cave.
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