- The definition of commensalism is a relationship between two organisms where one is helped and the other is unaffected.
An example of commensalism is when a bird lives in a tree; the bird is helped by living in the tree because it has a place to build its nest and it is high up so protected from predators, but the tree is not affected.
commensalism definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Biol. a close association or union between two kinds of organisms, in which one is benefited by the relationship and the other is neither benefited nor harmed
commensalism definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A symbiotic relationship between two organisms of different species in which one derives some benefit while the other is unaffected.
commensalism - Medical Definition
The American Heritage® Medical Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A symbiotic relationship in which one organism derives benefit and the other is unharmed.
commensalism - Science Definition
A symbiotic relationship in which one organism derives benefit while causing little or no harm to the other. Examples of commensalism include epiphytic plants, which depend on a larger host plant for support but which do not derive any nourishment from it, and remoras, which attach themselves to sharks and feed on their leavings without appreciably hindering their hosts. Compare amensalism, mutualism, parasitism.