The definition of symbiosis has varied among scientists. Some believe symbiosis should only refer to persistent mutualisms, while others believe it should apply to any type of persistent biological interaction (i.e. mutualistic, commensalistic, or parasitic).
The Golden Pledge, which is a System Plus Warranty with a 20 year leak guarantee, can pay for itself within the first ten years, sometimes many times over. The System Plus transforms the normal warranty by removing the small print.
Pinning â Term for a fraternity member giving his pin or a sweetheart pin to his girlfriend. Often a precursor to an engagement. Pledge â See New Member. Potential New Member â A person who is interested in joining an Greek letter organization, and will participate in rush, intake, or recruitment. Formerly called rushees by sororities, term is still used by fraternities. Also abbreviated to PNM.