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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.
a group within a political party or legislature or other organization that holds distinct views or has a particular function; "they are the progressive wing of the Republican Party"
n.
a division of some larger or more complex organization; "a branch of Congress"; "botany is a branch of biology"; "the Germanic branch of Indo-European languages"