intercept The intercept form of the equation of a line is x/a + y/b =1. in·ter·cept (ĭn′tər-sĕpt′) tr.v. in·ter·cept·ed, in·ter·cept·ing, in·ter·cepts 1. To stop, deflect, or interrupt the progress or intended course of: intercepted me with a message as I was leaving. 2. Sports a. To gain possession of (an opponent’s pass), as in …

