Parallel

Parallel may refer to:

Mathematics

Parallel (geometry), two lines in the Euclidean plane which never intersect
Parallel postulate, an axiom from Euclid's Elements establishing flat Euclidean geometry
Parallel transport, in differential geometry, a way of transporting geometrical data along smooth curves
Parallel (operator), mathematical operation named after the composition of electrical resistance in parallel circuits

Parallel (latitude), an imaginary east–west line circling a globe
Parallel of declination, used in astronomy
Parallel evolution, the similar development of a trait in unrelated biological species
Parallel circuit, with electrical components connected side-by-side (in a series circuit, components are connected end-to-end )
Parallel manipulator, a mechanical system with two platforms connected by linear actuators
Parallel cousin, in anthropology, a cousin from a parent's same-sex sibling (a cross-cousin is from a parent's opposite-sex sibling)
Parallel, a geometric term of location meaning "in the same direction"

Parallel chord
Parallel key, the minor (or major) key of a major (or minor) key with the same tonic

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

Parallel, a type of trench; see Siege#Age of gunpowder
Avinguda del Paral·lel
Parallel (filling stations operator), an operator in Ukraine's oil wholesale and retail markets