modulus (Latin)

Where does "modulus" come from?

The Latin noun 'modulus' originated as a diminutive form of the Latin word 'modus', combining 'modus' meaning 'measure, manner, way' with the diminutive suffix '-ulus'[1]. The base word 'modus' itself descends through Proto-Italic '*modos' from the Proto-Indo-European '*mod-ós' meaning 'measure', which traces back to the root '*med-' meaning 'to measure'[2].

Open questions

• The derivation from Proto-Indo-European '*med-' is complicated by the expected oblique cases appearing as '*moder-', leaving some aspects of the morphological development disputed. [2]

Full etymology tree

• modulus (Latin), 'diminutive of modus (“measure, metre, mode; method”):'
  • derived modus (Latin), 'measure'
    • inherited *modos (Proto-Italic)
      • derived *mod-ós (Proto-Indo-European)
        • derived *med- (Proto-Indo-European), 'to measure'
        • suffix *-os (Proto-Indo-European), 'Creates action nouns or result nouns from verbs.'
  • suffix -ulus (Latin), 'Used to form a diminutive of a noun, indicating small size or youth.'

Ancestors

• modus (Latin)
• -ulus (Latin)

Descendants and derived words

• modulor (Latin)

Sources

1. modulus (Latin) - Wiktionary
2. modus (Latin) - Wiktionary

Updated August 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris