Contents [of a Communication]
50 U.S.C. § 1801(n) (2010) (Title 50—Chapter 36: Foreign Intelligence Surveillance—Subchapter A: Electronic Surveillance)
“Contents”, when used with respect to a communication, includes any information concerning the identity of the parties to such communication or the existence, substance, purport, or meaning of that communication.
18 U.S.C. § 2510(8) (Title 18—Chapter 119: Wire and Electronic Communications Interception and Interception of Oral Communications)
As used in this chapter [18 U.S.C. §§ 2510 et seq.]—
(8) "contents", when used with respect to any wire, oral, or electronic communication, includes any information concerning the substance, purport, or meaning of that communication;