undulation
"undulation" is a 10-letter English headword indexed on PlainSpell.
The verdict
“undulation” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 10
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - An instance or act of undulating.
Corpus desk
Index EN-undulation · undulation · English
undulation · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 10 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "U" 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.
| Property | Value |
|---|---|
| Headword | undulation |
| Language | English |
| Part of speech | Noun |
| Letters | 10 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “undulation” in English
Rare enough to double-check
undulation is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. 7 senses are on record.
Our edit-distance generator produced no likely misspellings for undulation, and the word's spelling is regular enough that our generator found nothing worth flagging. No close-neighbour confusable shows up for this headword in our dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Etymologically, the entry records: From undulate + -ion, or borrowed from Medieval Latin undulātiō; compare French ondulation. The correct English form is undulation, spelled U-N-D-U-L-A-T-I-O-N.
Definition
- 1An instance or act of undulating.
- 2A wavy appearance or outline; waviness.
- 3A tremulous tone produced by a peculiar pressure of the finger on a string.
- 4A wavelike curve; a smooth and regular rise and fall.
- 5A wavelike motion of the air; electromagnetic radiation.
- 6A feeling as if of an undulatory motion about the heart.
- 7The distinctive motion of the matter within an abscess on being pressed when it is ripe for opening.
Recorded use
Wiktionary exampleThese source excerpts show how undulation appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
But the next undulation would raise us, showing the island ablaze in the sunlight, an emerald of dazzling beauty resting lightly on the bosom of the sea.
Etymology
From undulate + -ion, or borrowed from Medieval Latin undulātiō; compare French ondulation.
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.