Definition of 411
a telephone number for directory information.
Informal.the 411, information or knowledge, usually about an event or activity and acquired by oral communication:
Here's the 411 on tomorrow night's party.Planning for Spring Break in Cabo—what's the 411?"
Definition of 411 a telephone number for directory information. Informal.the 411, information or knowledge, usually about an event or activity and acquired by oral communication: Here's the 411 on tomorrow night's party. Planning for Spring Break in Cabo—what's the 411?"