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The lack of ability to move freely and actively.


Sessility pertains to the state in certain animals wherein they are permanently attached or fixed to a substrate. For example, adult sponges, corals, and hydra are animals that exhibit sessility. For these animals, sessility aids them to clump in groups.

In plants, sessility refers to the state of being stalkless and attached at the base, such as certain leaves that show sessility.

Word origin: Neo-Latin sessilis, sitting

Related forms: sessile (adjective)

Compare: motility