enlighten (English)

Where does "enlighten" come from?

The English verb 'enlighten' traces back to Proto-Indo-European roots, developing from '*h₁én' meaning 'in'[4] and '*lewk-' meaning 'to shine'[7]. In Proto-Germanic, these elements merged into '*inliuhtijaną'[2][3], which passed into Old English as 'inlīhtan' or 'onlīhtan', meaning 'to enlighten, illuminate, give light to, give sight to'[1]. By Middle English, the verb took shape as 'enlightenen' or 'inlightnen', arising as a hybrid of 'inlighten' and 'lightnen'[1]. Over time, the literal sense of shedding physical light broadened into the figurative meaning of providing clarity and imparting knowledge.

Open questions

Proto-Germanic '*liuhtijaną' may have derived either as a denominative verb from the noun '*leuhtą' or as a factitive verb from the adjective '*leuhtaz'. [5]

Full etymology tree

enlighten (English), 'To supply with light.'
- inherited enlightenen (Middle English)
  - blend inlighten (Middle English)
    - inherited inlihtan (Old English), 'to illuminate, make bright, cause to shine'
      - inherited *inliuhtijaną (Proto-Germanic), 'to enlighten, illumine'
        compound *in (Proto-Germanic), 'in'
        inherited *h₁én (Proto-Indo-European), 'in'
        compound *liuhtijaną (Proto-Germanic), 'to give light, shine'
  - blend lightnen (Middle English)

Ancestors

inlihtan (Old English)

Cognates and doublets

inlichten (Dutch)
𐌹𐌽𐌻𐌹𐌿𐌷𐍄𐌾𐌰𐌽 (Gothic)

Descendants and derived words

enlightenable (English)
enlightener (English)
enlightenment (English)

Sources

Updated September 2026

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