Definitions of sequester:

• verb:   requisition forcibly, as of enemy property

  Example: "The estate was sequestered"

• verb:   set apart from others

  Example: "The dentist sequesters the tooth he is working on"

• verb:   undergo sequestration by forming a stable compound with an ion

  Example: "The cations were sequestered"

• verb:   keep away from others

  Example: "He sequestered himself in his study to write a book"

• verb:   take temporary possession of as a security, by legal authority