Other forms: intercepted; intercepting; intercepts
When you intercept a pass in football, you grab the ball that your opponent had thrown to a member of his own team. To intercept is to stop something from reaching its intended destination.
If a national intelligence agency intercepts a telephone call being sent from one terrorist cell to another, they stop the message and also learn a bit about what's going on in the terrorist world. If you're planning a surprise party for your friend and she arrives a half hour early, you might run to intercept her while everyone rushes to hide.