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n.
a group of persons associated by some common tie or occupation and regarded as an entity; "the whole body filed out of the auditorium"; "the student body"; "administrative body"
n.
(ecology) a group of organisms (plants and animals) that live together in a certain geographical region and constitute a community with a few dominant species
n.
an organization regarded as part of a larger social group; "the coach said the offensive unit did a good job"; "after the battle the soldier had trouble rejoining his unit"
n.
the act of constituting a political unity out of a number of separate states or colonies or provinces so that each member retains the management of its internal affairs