MillimetervsMillimeternWhich spelling fits?

Which to use

“Millimeter” and “Millimetern” are a confusable German pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#8,420
“Millimeter” frequency rank
#38,903
“Millimetern” frequency rank
47323
confusion score

Side-by-Side Comparison

Feature Millimeter Millimetern
Definition ein tausendstel Meter Dativ Plural des Substantivs Millimeter

Where the eye mixes Millimeter and Millimetern

Muted = shared; highlighted = the visual trap. They share 10 letters in sequence.

10 ch
Millimeter
11 ch
Millimetern

Why the eye confuses Millimeter with Millimetern

A purely visual mix-up. Millimeter ([ˈmɪliˌmeːtɐ]) and Millimetern ([ˈmɪliˌmeːtɐn]) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 extra letter(s) - “Millimeter” sits inside “Millimetern”. Our composite confusion score for this pair is 47323, derived from the frequency rank of both members and their visual similarity.

Millimeter is recorded at frequency rank #8,420, classified as anoun, pronounced [ˈmɪliˌmeːtɐ]. Millimetern is at rank #38,903, tagged as anoun, pronounced [ˈmɪliˌmeːtɐn].

Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.

With a confusion score of 47323, this pair ranks #1,288,364 of 2,006,359 scored German confusable pairs - roughly mid-pack for confusability.

Orthographic DNA of Millimeter vs Millimetern

Shared letters: eilmrt. Private to "Millimeter": -. Private to "Millimetern": n.

"Millimeter" · 10 letters · shape CVCCVCVCVC  ·  "Millimetern" · 11 letters · shape CVCCVCVCVCC

Known mistypes of this pair

  • Millimeterimllimeter · mililmeter · milimeter · milliemter · millimeetr · millimeterr · millimetre · millimetter
  • Millimeternimllimetern · mililmetern · milimetern · milliemtern · millimeetrn · millimetenr · millimeternn · millimeterrn

Frequently Asked Questions

Do "Millimeter" and "Millimetern" mean the same thing in a sentence?
No. They are said differently ([ˈmɪliˌmeːtɐ] versus [ˈmɪliˌmeːtɐn]) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.
Which is more common, "Millimeter" or "Millimetern"?
"Millimeter" is the more common of the two: it sits at frequency rank #8,420 in our German list, against #38,903 for "Millimetern". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

What to do next

Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.

  • Full dictionary entry for "Millimeter" with definition, IPA, and generated misspellings. Word entry
  • Full dictionary entry for "Millimetern" - compare definitions side by side with the headword page. Word entry
  • This pair ranks #1,288,364 of 2,006,359 scored German confusable pairs in this corpus vintage. Corpus statistics
  • Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes

Confusion rank #1,288,364 of 2,006,359 scored German pairs, corpus vintage 2026-09-03, not spelling advice.

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

Source: FrequencyWords open word-frequency list