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1.
Adjective version of intense; to be used to describe an intense moment.
Woah man, that conversation was so intensive...

John, why do you have to be so intensive?
by agirlperson July 18, 2010
 
2.
1. Of, relating to, or characterized by intensity: intensive training.
2. Possessing or requiring to a high degree. Often used in combination: research-intensive; labor-intensive.
SSD - Software Systems Development Program.

by Anonymous February 20, 2003