Parallel may refer to:

Mathematics

Parallel (geometry) In geometry, parallel lines are coplanar infinite straight line (geometry), lines that do not intersecting lines, intersect at any point. Parallel planes are plane (geometry), planes in the same three-dimensional space that never meet. ''Paral ...

, two lines in the Euclidean plane which never intersect *

Parallel (operator) The parallel operator \, (pronounced "parallel", following the parallel lines notation from geometry; also known as reduced sum, parallel sum or parallel addition) is a binary operation which is used as a shorthand in electrical engineering, ...

, mathematical operation named after the composition of electrical resistance in parallel circuits

Science and engineering

* Parallel (latitude), an imaginary east–west line circling a globe * Parallel of

declination In astronomy, declination (abbreviated dec; symbol ''δ'') is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. The declination angle is measured north (positive) or ...

, used in astronomy * Parallel, a

geometric term of location Geometric terms of location describe directions or positions relative to the shape of an object. These terms are used in descriptions of engineering, physics, and other sciences, as well as ordinary day-to-day discourse. Though these terms themse ...

meaning "in the same direction" * Parallel electrical circuits

Computing

* Parallel (software), a UNIX utility for running programs in parallel

Language

* Parallelism (grammar), a balance of two or more similar words, phrases, or clauses * Parallelism (rhetoric)

Entertainment

* ''Parallel'' (manga) * ''Parallel'' (2018 film), a Canadian science fiction thriller film * ''Parallel'' (2024 film) an American science fiction thriller film * ''Parallel'' (video), a compilation of music videos by R.E.M. * ''Parallel'' (The Black Dog album), 1995 * ''Parallel'' (Four Tet album) * ''Parallel'' (EP), a 2017 EP by GFriend * "

The Parallel "The Parallel" is episode 113 of the American television anthology series '' The Twilight Zone''. In this episode an astronaut returns from a voyage to find the world not quite the same as he remembers it. It was an early example of the concept ...

", an episode of the TV series ''The Twilight Zone''

Music

Parallel harmony In music, parallel harmony, also known as harmonic parallelism, harmonic planing or parallel voice leading, is the Parallel motion (music), parallel movement of two or more melodies (see voice leading). Effects When all voices between chords mov ...

, a music composition technic *

Parallel key In music theory, a major scale and a minor scale that have the same starting note ( tonic) are called parallel keys and are said to be in a parallel relationship. Forte, Allen (1979). ''Tonal Harmony'', p.9. 3rd edition. Holt, Rinehart, and Wi ...

Other uses

* Parallel, a type of trench; see Siege#Age of gunpowder *

Avinguda del Paral·lel Avinguda del Paral·lel (; 'Avenue of the Parallel') is one of the main streets of the city of Barcelona, dividing Ciutat Vella, Eixample and Sants-Montjuïc districts. It receives this name because it is (unlike any other street in Barcelon ...

Parallel (filling stations operator) Parallel-M LTD is one of the leading operators in Ukraine's oil wholesale and retail markets. The company has been operating at the Ukrainian market of petroleum products since 1995. Its network consists of 80 filling stations under TM Parallel ...

, an operator in Ukraine's oil wholesale and retail markets *

Paral·lel station Paral·lel is a Barcelona Metro The Barcelona Metro (Catalan language, Catalan and Spanish language, Spanish: ) is a rapid transit network that runs mostly underground in central Barcelona and into the city's suburbs. It is part of ...

, a Barcelona Metro station