from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A condition of bodily strength, vigor, or vitality.
from The Century Dictionary.
- noun In pathology, strength; excessive force: opposed to asthenia or debility.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
strength, vigouror vitality
from The American Heritage® Dictionary of the English Language, 4th Edition
He assumed that the interaction between the excitability with which the body was endowed and the stimuli, external and internal, which it encountered during life determined health and the contrasting conditions of asthenia and sthenia.
Diseases occur according to increase or dimunition of the stimuli causing increased excitability, (sthenia) and weak stimuli diminished excitability (asthenia).