(ecology) The condition of living within the body or cells of another organism; an instance of an organism so living.
2014, Robert E. Blankenship, Molecular Mechanisms of Photosynthesis, Wiley Blackwell, 2nd Edition, page 226,
Evidence is now overwhelming that several groups of eukaryotic algae originated from a secondary endosymbiosis, in which a eukaryotic alga was incorporated into a second host (Palmer and Delwiche, 1996; Delwiche and Palmer, 1997; Delwiche, 1999; Keeling, 2010, 2013; Curtis et al., 2012).
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