NOUN (3)

1. a pale and sickly appearance;
- Example: "his etiolation signaled years in prison"

2. the act of weakening by stunting the growth or development of something;
- Example: "the etiolation of the critical tradition"

3. (botany) the act of causing a plant to develop without chlorophyll by growing it without exposure to sunlight;
- Example: "the etiolation of celery"

The Collaborative International Dictionary of English v.0.48:

Etiolation \E`ti*o*la"tion\, n.
   1. The operation of blanching plants, by excluding the light
      of the sun; the condition of a blanched plant.
      [1913 Webster]

   2. (Med.) Paleness produced by absence of light, or by
      disease. --Dunglison.
      [1913 Webster]

WordNet (r) 3.0 (2006):

etiolation
    n 1: a pale and sickly appearance; "his etiolation signaled
         years in prison"
    2: the act of weakening by stunting the growth or development of
       something; "the etiolation of the critical tradition"
    3: (botany) the act of causing a plant to develop without
       chlorophyll by growing it without exposure to sunlight; "the
       etiolation of celery"