c

Reading level: hard

Estimated CEFR level: B1 — Intermediate

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a degree on the centigrade scale of temperature
  2. noun the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
  3. noun a vitamin found in fresh fruits (especially citrus fruits) and vegetables; prevents scurvy

Etymology

Old English lower case letter c, from 7th century replacement by Latin lower case c of the Anglo-Saxon Futhorc letter ᚳ (c, “cen”).

In classic literature

Synonyms

degree centigrade, degree Celsius

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