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 May 6, 2026) - An instance or act of undulating.
| Property | Value |
|---|---|
| Headword | undulation |
| Language | English |
| Part of speech | Noun |
| Letters | 10 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “undulation” sits in English frequency
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.
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.
Frequently Asked Questions
How do you spell "undulation"?
What does "undulation" mean?
What is the origin of the word "undulation"?
Is PlainSpell free to use?
Using “undulation”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is U-N-D-U-L-A-T-I-O-N - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.