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ENGLISH · A WORD WITH POSSIBILITIES

reflex.

An automatic response to a simple stimulus which does not require mental processing.

6 characters2 syllables approx.English language

Meaning & usage

noun/ˈɹiːflɛks/
  1. An automatic response to a simple stimulus which does not require mental processing.

  2. The descendant of an earlier language element, such as a word or phoneme, in a daughter language.

  3. The ancestor word corresponding to a descendant.

    rare
  4. The descendant of anything from an earlier time, such as a cultural myth.

  5. A reflection or an image produced by a reflection; the light reflected from an illuminated surface to one in shade.

    A reflex camera uses a mirror to reflect the image onto a ground-glass viewfinder.
Where this word comes from

From Late Latin reflexus, past participle of reflectere (“to bend back”), equivalent to re- + flex. Photography sense is from noun sense meaning “reflection”. Compare English reflect.

adj/ˈɹiːflɛks/
  1. Bent, turned back or reflected.

  2. Produced automatically by a stimulus.

  3. Having greater than 180 degrees but less than 360 degrees.

  4. Illuminated by light reflected from another part of the same picture.

Where this word comes from

From Late Latin reflexus, past participle of reflectere (“to bend back”), equivalent to re- + flex. Photography sense is from noun sense meaning “reflection”. Compare English reflect.

verb/ɹɪˈflɛks/
  1. To bend back or turn back over itself.

    transitive
  2. To reflect (light, sight, etc.).

    obsolete · transitive
  3. To reflect or mirror (an object), to show the image of.

    obsolete · transitive
  4. To cast (beams of light) on something.

    obsolete · transitive
  5. To respond to a stimulus.

Where this word comes from

From Late Latin reflexus, past participle of reflectere (“to bend back”), equivalent to re- + flex. Photography sense is from noun sense meaning “reflection”. Compare English reflect.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.