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.
If you pledge something such as a valuable possession or a sum of money, you leave it with someone as a guarantee that you will repay money that you have borrowed. He asked her to pledge the house as security for a loan. Synonyms: bind, guarantee, mortgage, engage More Synonyms of pledge. More Synonyms of pledge.