Cession

n. concession, capitulation, yielding of territory or property

Most broadly, cession (to cede) is the assignment of property to another entity. In international law it commonly refers to land transferred by treaty. Cession is "a surrender; a yielding; a giving up." It is voluntary, as opposed to annexation, which is forcible. In one example, Maryland and Virginia both ceded land in 1790 to become the District of Columbia, specified in the U.S. Constitution of the previous year. The Virginia portion was given back in 1847, a process known as retrocession. Territory can also be ceded for payment, such as in the Louisiana Purchase and Alaska Purchase. Even fraud can be involved, such as in the Treaty of New Echota, whereby lands already taken in 1832 by outright theft of the U.S. state of Georgia were later "ceded" to the state by a Cherokee leader.
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Noun
1. the act of ceding
(synonym) ceding
(hypernym) relinquishment, relinquishing
(hyponym) recession, ceding back
(derivation) concede, yield, cede, grant

n. transfer, cession, disposal; grant, surrender; yielding, assignation

(n.)
The voluntary surrender of a person's effects to his creditors to avoid imprisonment.
  

(n.)
The giving up or vacating a benefice by accepting another without a proper dispensation.
  

(n.)
Concession; compliance.
  

(n.)
A yielding, or surrender, as of property or rights, to another person; the act of ceding.
  

(n.)
A yielding to physical force.