noun Ecology.
the establishment of an immigrant plant in a new environment.

1900–05; < Greek oíkēsis an inhabiting, equivalent to oikē-, variant stem of oikeîn to inhabit (derivative of oîkos house) + -sis -sis

ecesic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ecesis (ɪˈsiːsɪs)
the establishment of a plant in a new environment
[C20: from Greek oikēsis a dwelling in, from oikein to inhabit; related to oikos a house]

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