Eavesdropping n. : The habit of lurking about dwelling houses, and other places where persons meet fro private intercourse, secretly listening to what is said, and then tattling it abroad. The offense is indictable at common law.

Example:
Excuse me, can I find the the pinhole cameras and Eavesdropping devices in my house?

Taxonomy
free encyclopedia, eaves, eavesdroppers, occupants, conversations, Great Hall, SIGINT, eavesdrip, HUMINT, search, private conversation, consent, old adage, Origin, visibility, hole, entrance, admission.

Defination from the web:
Eavesdropping is the act of secretly listening to the private conversation of others without their consent, as defined by Black's Law Dictionary. ... Eavesdropping can also be done over telephone lines (wiretapping), email, instant messaging, and other methods of communication considered ...