isochronous

adj

"isochronous" is a 11-letter English headword indexed on PlainSpell.

The verdict

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

Unranked
below top-frequency English
11
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Happening at regular intervals; isochronal.

Corpus desk

Index EN-isochronous · isochronous · English

isochronous · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-MEGA 11 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "I" 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 isochronous
PropertyValue
Headwordisochronous
LanguageEnglish
Part of speechAdjective
Letters11
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “isochronous” in English

isochronousfalls 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

isochronous is uncommon English outside the top frequency list, classed as anadjective. Rarity is why readers land here mid-draft. 4 senses are on record.

Zero misspellings are on record for isochronous in our index, suggesting the orthography follows predictable English patterns. We don't track a confusable pairing for this entry, since no other headword is close enough in sound or shape to pair with it.

Etymologically, the entry records: From Ancient Greek ἴσος (ísos, “equal”) + Ancient Greek χρόνος (khrónos, “time”) + -ous. The correct English form is isochronous, spelled I-S-O-C-H-R-O-N-O-U-S.

Definition

  1. 1
    Happening at regular intervals; isochronal.
  2. 2
    Happening at the same time; simultaneous.
  3. 3
    Of or pertaining to the use of clocks derived from the same clock reference.
  4. 4
    Of or pertaining to data associated with time-sensitive applications.

Recorded use

Wiktionary examples

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

  1. We observed, on attentive examination, the following phenomena: cough, with sense of constriction in the middle of the chest; orthopnœa, threatening suffocation; face violet coloured; lips swollen; beatings of the jugular veins isochronous with those of the carotid arteries; palpitation; […]
  2. Their entire national telephone network is isochronous, with a clock distribution tree radiating from a single, protected cesium reference clock.

Etymology

From Ancient Greek ἴσος (ísos, “equal”) + Ancient Greek χρόνος (khrónos, “time”) + -ous.

Synonyms

isochronalisochronic

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 "isochronous"?
"isochronous" is spelled I-S-O-C-H-R-O-N-O-U-S.
What does "isochronous" mean?
As an adjective, "isochronous" means: Happening at regular intervals; isochronal.
What is the origin of the word "isochronous"?
From Ancient Greek ἴσος (ísos, “equal”) + Ancient Greek χρόνος (khrónos, “time”) + -ous. 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