What is the meaning of the word "etiolation"?

Definitions:

  1. (botany) the act of causing a plant to develop without chlorophyll by growing it without exposure to sunlight copy to clipboard noun
    • the etiolation of celery copy to clipboard
  2. a pale and sickly appearance copy to clipboard noun
    • The etiolation signaled years in prison. copy to clipboard
  3. the act of weakening by stunting the growth or development of something copy to clipboard noun
    • the etiolation of the critical tradition copy to clipboard