18 U.S.C. § 2510(1) (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.]—
(1) "wire communication" means any aural transfer made in whole or in part through the use of facilities for the transmission of communications by the aid of wire, cable, or other like connection between the point of origin and the point of reception (including the use of such connection in a switching station) furnished or operated by any person engaged in providing or operating such facilities for the transmission of interstate or foreign communications or communications affecting interstate or foreign commerce;
50 U.S.C. § 1801(l) (2010) (Title 50—Chapter 36: Foreign Intelligence Surveillance—Subchapter A: Electronic Surveillance)
“Wire communication” means any communication while it is being carried by a wire, cable, or other like connection furnished or operated by any person engaged as a common carrier in providing or operating such facilities for the transmission of interstate or foreign communications.