mm

See also: Appendix:Variations of "mm"

㎜ U+339C, ㎜ SQUARE MM ← ㎛ [U+339B] CJK Compatibility ㎝ → [U+339D]

Translingual

Alternative forms

• (roman numeral): MM, MDD, mdd

Etymology

From m- (“milli-”) +‎ m (“metre”).

Symbol

mm

2. (metrology) Symbol for millimetre (millimeter), an SI unit of length equal to 10⁻³ metres (meters).
   • 2015 December 3, “Positron Emission Tomography and Magnetic Resonance Imaging of the Brain in Fabry Disease: A Nationwide, Long-Time, Prospective Follow-Up”, in PLOS ONE‎^[1] (in English), →DOI, archived from the original on 5 November 2025:

     PET images of the FDG distribution were reconstructed using a 4.0 mm Hanning filter transaxially and an 8.5 mm Ramp filter axially.

   • 2025 September 26, Grant Maloy Smith, “What Is a Strain Gauge Sensor and How Does It Work?”, in DEWESoft‎^[2], archived from the original on 14 November 2025:

     A strain is a dimensionless quantity and is usually expressed in percentages. Typical measures for strain are less than 2 mm/m for steel and are often expressed in micro-strain units. One microstrain is the strain producing deformation of one part per million.

   • (Can we date this quote?), “What is a Strain Gage?”, in Micro-Measurements‎^[3] (in English), archived from the original on 13 December 2025:

     Although it has no dimensions, strain is usually expressed in units represented as ε, which is in/in or mm/mm. Since the magnitude of the measured strain is small, the standard practice is to use units of microstrain (µε), which is [ε x 10^-6].

English

Pronunciation

• Audio (US):

  (file)

Noun

mm

1. Abbreviation of month, in two-digit numeric format, as in: dd/mm/yyyy.

Interjection

mm

1. Alternative form of mmm.

See also

• mm hmm

Egyptian

Etymology

Both Gardiner and Allen suggest the preposition could be a reduplication of m (“in”). Gardiner takes the adverb separately and considers it apparently an 18th Dynasty development from jmj.

Pronunciation

• (modern Egyptological) IPA^(key): /mɛm/
  • Conventional anglicization: mem

Preposition

1. among

Usage notes

Only used with plural pronouns and plural nouns, e.g. ẖrd mm bꜣkw (“a child among the servants”) or nouns with a plural sense, e.g. ngꜣw mm mnmnt (“A steer amongst the herd”).

mm is used in a more abstract or general sense than jmjtw, which refers more to a specific physical position among some nouns.

Inflection

Adverbial forms of mm  

mm	mm jrj

Alternative forms

Alternative hieroglyphic writings of mm  

mm	mmj	mmj	mmj

Derived terms

• mm jrj

Adverb

1. among them, therein

Alternative forms

See the alternative forms given for the prepositional usage above.

See also

• 𓅔

References

• James P[eter] Allen (2010), Middle Egyptian: An Introduction to the Language and Culture of Hieroglyphs, 2nd edition, Cambridge: Cambridge University Press, →ISBN, page 86.
• Faulkner, Raymond Oliver (1962), A Concise Dictionary of Middle Egyptian, Oxford: Griffith Institute, →ISBN

Finnish

Noun

mm

1. (cooking) abbreviation of maustemitta

Phrase

mm

1. misspelling of mm.

Norwegian Bokmål

Alternative forms

• m.m.
• MM

Etymology 1

Short form of måned (“month”), from Old Norse mánaðr (“month”), from Proto-Germanic *mēnōþs (“month”), from a derivative of Proto-Indo-European *mḗh₁n̥s (“moon, month”), from earlier *méh₁n̥ss, probably from *meh₁- (“to measure”).

Pronunciation

• IPA^(key): /mɔːnə(d)/
• Rhymes: -ɔːnə, -əd
• Hyphenation: m‧m
• Homophones: måne, måned

Noun

mm

1. abbreviation of måned (“month”), in a two-digit numeric format used for dates

   Synonym: måned

   dd/mm/åååå ― dd/mm/yyyy

Synonyms

• måned

Related terms

• ddmmåå, ddmmåååå, DDMMÅÅ, DDMMÅÅÅÅ, dd/mm/åå, dd/mm/åååå, DD/MM/ÅÅ, DD/MM/ÅÅÅÅ

See also

• dd, åååå, åå

Etymology 2

Short form of millimeter ("millimeter").

Symbol

mm

1. (metrology) Symbol for millimeter (millimetre), an SI unit of length equal to 10⁻³ meters (metres).

   Synonym: millimeter

Etymology 3

An onomatopoeia for a sound made by the human mouth.

Pronunciation

• IPA^(key): /mː/, /əm/, /mːm̩/
• Rhymes: -əm
• Hyphenation: mm
• Homophones: mhm, ehm

Interjection

mm

1. (onomatopoeia) An expression used to show contentment for something which smells or tastes good

   mm, paien lukter himmelsk!

   mm, the pie smells heavenly!

2. (onomatopoeia) An expression used to show thought, reflection or hesitation

   mm, jeg er ikke helt sikker...

   mm, I am not so sure...

   Synonym: ehm

3. (onomatopoeia) An expression used to express agreement with something

   mm, det er jeg helt enig i!

   mm, I completely agree with that!

   Synonym: mhm

Synonyms

• ehm, mhm

References

• “mm” in The Bokmål Dictionary.
• “mm” in Norwegian Academy Dictionary (NAOB).

Portuguese

Noun

mm m (plural mms)

1. (Internet slang, text messaging) abbreviation of mesmo (“the same”)

Adjective

mm m or f (plural mms)

1. (Internet slang, text messaging) abbreviation of mesmo / mesma (“same”)

Adverb

mm

1. (Internet slang, text messaging) abbreviation of mesmo (“really”)

Romanian

Interjection

mm

1. (Internet slang, text messaging) abbreviation of morții mă-tii

   duten mm

   (du-te în morții mă-tii)

Spanish

Noun

mm m (plural mms)

1. abbreviation of milímetro
2. (Internet slang, text messaging) mamá

Swahili

Pronoun

mm

1. (Internet slang, text messaging) abbreviation of mimi (“I”).

Swedish

Alternative forms

• m.m.

Phrase

mm

1. initialism of med mera