Verb (used with object) : to segregate exceptional children; to segregate hardened criminals.    From Dictionary.com. 

“2 The term “Presidential records” means documentary materials, or any reasonably segregable portion thereof, created or received by the President, his immediate staff, or a unit or individual of the Executive Office of the President whose function is to advise and assist the President, in the course of conducting activities which relate to or have an effect upon the carrying out of the constitutional, statutory, or other official or ceremonial duties of the President.”.    From Wordnik.com.  [The Volokh Conspiracy » Should Hillary Clinton’s White House Records Be Disclosed?] Reference

See 44 USC 2204 (b) (1): "Any Presidential record or reasonably segregable portion thereof containing information within a category restricted by the President under subsection (a) shall be so designated by the Archivist and access thereto shall be restricted until the earlier of ... the date on which the former President waives the restriction on disclosure of such record, or ... the expiration of the duration specified under subsection (a) for the category of information on the basis of which access to such record has been restricted.".    From Wordnik.com.  [Obama: I Don't Have Records From My Time In State Senate] Reference

Defendants shall preserve throughout the pendency of this litigation all documentary material, or any reasonably segregable portion thereof created or received by the Vice President, his staff, or a unit or individual of the Office of the Vice President whose function is to advise and assist the Vice President, in the course of conducting activities which relate to or have an effect upon the carrying out of the constitutional, statutory, or other official or ceremonial duties of the Vice President, without regard to any limiting definitions that Defendants may believe are appropriate.    From Wordnik.com.  [Spellbound Blog] Reference