side-by-side

adj

"side-by-side" is a 10-letter English headword indexed on PlainSpell.

The verdict

“side-by-side” is uncommon English (outside the top frequency list), classed as an adjective. The kind of spelling people second-guess.

Unranked
below top-frequency English
12
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Adjacent; juxtaposed.

Corpus desk

Index EN-side-by-side · side-by-side · English

side-by-side · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-MEGA 12 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "S" thin
  • PHOTO-UNK Peer pending

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Key facts for side-by-side
PropertyValue
Headwordside-by-side
LanguageEnglish
Part of speechAdjective
Letters12
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “side-by-side” in English

side-by-sidefalls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

side-by-side is uncommon English outside the top frequency list, classed as anadjective. Rarity is why readers land here mid-draft. Gloss: "Adjacent; juxtaposed.".

We couldn't generate a plausible misspelling set for side-by-side, a straightforward case of a spelling with little room for common typos. No close-neighbour confusable shows up for this headword in our dataset, a sign it's visually distinctive enough not to be mixed up with another word.

Etymologically, the entry records: From side + by + side. The correct English form is side-by-side, spelled S-I-D-E---B-Y---S-I-D-E.

Definition

  1. 1
    Adjacent; juxtaposed.

Recorded use

Wiktionary examples

These source excerpts show how side-by-side appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. The cylinder banks are at 60 deg. with the cylinders staggered to allow for side-by-side connecting rods on each crank.
  2. A “moving platform” scheme[…]is more technologically ambitious than maglev trains even though it relies on conventional rails. Local trains would use side-by-side rails to roll alongside intercity trains and allow passengers to switch trains by stepping through docking bays.

Etymology

From side + by + side.

This word in other languages

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "side-by-side"?
"side-by-side" is spelled S-I-D-E---B-Y---S-I-D-E.
What does "side-by-side" mean?
As an adjective, "side-by-side" means: Adjacent; juxtaposed.
What is the origin of the word "side-by-side"?
From side + by + side. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list