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Webster's Dictionary (1865)

In-tĕn'sĭve, a.

adjective

[Fr. intensif, It. & Sp. intensivo. See INTENSE.]

  1. Stretched, or admitting of extension, or increase of degree.
  2. Intent; unremitted; assiduous; intense. “Intensive circumspection.” Wotton.
  3. (Gram.) Serving to give force or emphasis; as, an intensive verb or preposition.