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n.
a specialized division of a large organization; "you'll find it in the hardware department"; "she got a job in the historical section of the Treasury"
n.
an administrative unit of government; "the Central Intelligence Agency"; "the Census Bureau"; "Office of Management and Budget"; "Tennessee Valley Authority"
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 situation from which extrication is difficult especially an unpleasant or trying one; "finds himself in a most awkward predicament"; "the woeful plight of homeless people"
v.
furnish with a preface or introduction; "She always precedes her lectures with a joke"; "He prefaced his lecture with a critical remark about the institution"
v.
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing; "She elaborated on the main ideas in her dissertation"