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Definition of intensive : 1. Characterized by persistence; intent; unremitted; assiduous; intense.
2. Designating, or pertaining to, any system of farming or horticulture, usually practiced on small pieces of land, in which the soil is thoroughly worked and fertilized so as to get as much return as possible; - opposed to extensive.
3. Serving to give force or emphasis; as, an intensive verb or preposition.
4. Stretched; admitting of intension, or increase of degree; that can be intensified.
5. That which intensifies or emphasizes; an intensive verb or word.

Synonyms:

intense, whole, absolute, exhaustive, part, strong, complete, concentrated, collect, heavy, edge, fast, big, intensifier, accelerated, full-dress, careful, thoroughgoing, thoroughpaced, exclusive, thorough, fierce, undivided, all-out, heightened, unswerving

Usage examples:

• If the teacher will assign the lesson proper to all of the class and then select certain aspects- certain suggested problems- for more intensive research, the reports on special topics can be made to contribute wonderfully to the richness of the class hour. - "Principles of Teaching", Adam S. Bennion.
• For the local market: the acreage may be small; the market must be near and prices must be high; the sales are direct to the consumer; there must be succession in ripening; and intensive culture is practiced. - "Manual of American Grape-Growing", U. P. Hedrick.
• As night approached, the search became more intensive, but it was not until after nightfall that a tank was found. - "Grace Harlowe's Overland Riders on the Great American Desert", Jessie Graham Flower.