Webster’s Revised Unabridged Dictionary · 1913
Intensive
In·ten′sive (·sĭv), a. [Cf. F. intensif. See Intense.]
1. Stretched; admitting of intension, or increase of degree; that can be intensified. Sir M. Hale.
2. Characterized by persistence; intent; unremitted; assiduous; intense. [Obs.] Sir H. Wotton.
3. (Gram.) Serving to give force or emphasis; as, an intensive verb or preposition.
In·ten′sive, n. That which intensifies or emphasizes; an intensive verb or word.