English Reference
adjective · noun · verb

parallel

adj. · n. · v.
US /ˈpɛɹəˌɫɛɫ/ UK /pˈæɹəlˌɛl/ par·al·lel UK spelling paralleled, parallelled, parallelling, parallels

  1. 01 B1 Intermediate Math

    adj.describing two lines that stay the same distance apart and never touch.

    adj.describing lines or planes that are equidistant at all points and never intersect.

    Simple

    The train tracks run parallel to each other for miles.

    In context

    The architect ensured that the support beams remained perfectly parallel to the floor to maintain the structural integrity of the glass ceiling.

    equidistantaligned
  2. 02 B2 Upper Intermediate

    adj.happening at the same time or being very similar.

    adj.occurring simultaneously or having a similar development, nature, or tendency.

    Simple

    The two countries followed parallel paths toward economic growth.

    In context

    The researchers noted parallel developments in both test groups, despite the different environmental variables introduced at the start of the study.

  3. 03 C1 Advanced Technical Computing

    adj.doing many tasks at the same time using different parts of a computer.

    adj.relating to the simultaneous execution of multiple operations or tasks by a computer system.

    Simple

    Parallel processing allows the computer to handle complex graphics quickly.

    In context

    By utilizing parallel computing architectures, the laboratory was able to reduce the data processing time from weeks to mere hours.

  4. 04 B2 Upper Intermediate

    n.a way in which two things are similar or can be compared.

    n.a person or thing that is similar or analogous to another; a comparison that highlights such similarities.

    Simple

    It is easy to see a parallel between this movie and the book.

    In context

    Historians often draw a parallel between the fall of the Roman Empire and the decline of modern superpowers.

  5. 05 B2 Upper Intermediate Geography

    n.an imaginary line around the Earth that is parallel to the equator.

    n.an imaginary circle on the earth's surface that is parallel to the plane of the equator, marking latitude.

    Simple

    The 38th parallel is a famous border between North and South Korea.

    In context

    The expedition crossed the 45th parallel, marking the halfway point between the equator and the North Pole.

    latitude line
  6. 06 C1 Advanced Academic

    v.to be very similar to something else or to happen at the same time.

    v.to be similar to or to correspond with something; to run in the same direction as something else.

    Simple

    The rise in prices parallels the increase in the cost of fuel.

    In context

    The author's personal life often parallels the struggles of the characters in her novels, suggesting a strong autobiographical influence.

Usage closely parallel · finding parallel

Educational opportunities are diverging in parallel with economic ones.

The Guardian· 13 Aug 2026

As you’ll soon see, there are many parallels between LLMs and world models in terms of architecture and how people expect them to improve over time.

Ars Technica· 13 Jul 2026

From Middle French parallèle and its etymon Latin parallēlus, parallēlos. The verb is from the noun. By surface analysis, par- + all- + -el.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin parallēlus,parallēlos
Level B2 · Upper Intermediate
Frequency Common
Updated