from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The existence of many different forms.
from the GNU version of the Collaborative International Dictionary of English
- n. Existence in many forms; polymorphism.
from The Century Dictionary and Cyclopedia
- n. Same as polymorphism.
Sorry, no etymologies found.
Leaving aside polymorphy, we may now discuss those cases of variability, in which the changes themselves, and not only their final results play a part.
In the first signification it is nearly identical with polymorphy, or richness of types, especially so when these  types are themselves quite stable, or when it is not at all intended to raise the question of their stability.
The mechanism functions best when the polymorphy occurs at the most specific step in the pathway, as that increases the fraction of epitope precursors that is not under selection pressure.