parallel

A parallel (from the Greek παράλληλος parállelos "next to each other" - composed of παρὰ parà "at", "next to" and ἀλλήλων allḗlon "each other", "mutually") is:

• in geometry one of two straight lines that lie in one plane and do not intersect, see parallelism (geometry)
• a similarity in behavior or facts ("historical parallel")
• in music a shift in pitch, see parallel (music)
• especially in music theory a relationship between keys, see parallel key
• also a relationship between triads in music theory, see parallel sound
• Parallel (military) , trenches at the same distance from the fortress

See also

• parallelism
• parallelogram
• parallelism
• Parallel connection
• Parallel society
• Parallel programming
• Parallel interface

This is a disambiguation page for differentiating between several terms identified with the same word.