From the Greek for “together” and “living,” it was meant to describe a newly identified kind of relationship between organisms. In 1877 Bennett used the word symbiosis (which previously had been used of people living together in community) to describe the mutualistic relationship in lichens. Heinrich Anton de Bary - Formalized the idea of symbiosis in the 19th century - was an expert on fungal diseases of plants - discovered that lichens are made up of multiple organisms. An essential yet underappreciated ingredient of modern biology is symbiosis, first defined by Heinrich Anton de Bary in 1879 as the “living together of unlike organisms.” Symbioses include organisms that form mutually beneficial partnerships and associations between parasites and their hosts, as well as interactions less easy to categorize. In 1879 by the German mycologist Heinrich Anton de Bary, defined it as “the living together of unlike organisms.” In 1877, Albert Bernhard Frank used the term symbiosis to describe the mutualistic relationship in lichens.In 1878, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms". Symbiosis (from Greek συμβίωσις "living together", from σύν "together" and βίωσις "living") is any type of a close and long-term biological interaction between two different species, be it mutualistic, commensalistic, or parasitic.In 1879, Heinrich Anton de Bary defined it as "the living together of unlike organisms." In 1879, Heinrich Anton de Bary defined symbiosis as “the living together of unlike organisms”. Mutualism. [2] [3] There is no single universally agreed upon definition of symbiosis. An essential yet underappreciated ingredient of modern biology is symbiosis, first defined by Heinrich Anton de Bary in 1879 as the “living together of unlike organisms.” Symbioses include organisms that form mutually beneficial partnerships and associations between parasites and their hosts, as well as interactions less easy to categorize. The term was introduced into scientific usage in 1879 by Heinrich Anton de Bary, professor of botany at the University of Strasbourg. Symbiosis definition is - the living together in more or less intimate association or close union of two dissimilar organisms (as in parasitism or commensalism); especially : mutualism. The word “symbiosis” was originally coined by Heinrich Anton de Bary (1831-1888), botanist, microbiologist, surgeon, and mycologist (because that’s just how people rolled in the 1800’s). In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms." De Bary used symbiosis in a global sense to refer to any close association between two heterospecific organisms. In the late 1870s, German scientists Albert Frank and Heinrich Anton de Bary introduced the term “symbiosis” to biology. The term was first used in 1879 by the German mycologist, Heinrich Anton de Bary, who defined it as: "the living together of unlike organisms". The definition of symbiosis was a matter of debate for 130 years. Mutualism When two organisms of different species work together, each benefiting from the relationship. The original definition was given thusly, in German, in his book “Die Erscheinung der Symbiose”: Okay, What Is “Symbiosis”? The definition of symbiosis has varied among scientists. Examples include Bees and flowers Symbiosis: Types of relationships Any type of a close, long-term relationship between two different organisms. The answer to why lies in the concept of symbiosis.