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Definition of extensively : To a great extent; widely; largely; as, a story is extensively circulated.

Synonyms:

big-time, utterly, enormously, staggeringly, monstrously, monumentally, vastly, stupendously, much, tremendously, astronomically, colossally, considerably

grandiosely, amply, greatly, massively, majestically, magnificently, copiously, loftily, princely, comprehensively, capaciously, grandly, spaciously, gigantically, toweringly, impressively, sizably, voluminously, expansively, generously, hugely, largely

corpulently, chunkily, dimensionally, highly, widely, broadly

Usage examples:

• Around London the cauliflower has been extensively grown for a longer time than anywhere else, and it is there regarded as one of the most important garden crops. - "The Cauliflower", A. A. Crozier.
• Intimately conversant with the rise and progress of every negotiation with foreign powers, pending or concluded; personally acquainted with the capacity and attainments of most of the public men of this country whom it might be proper to employ in the public service; extensively possessed of much of that valuable kind of information which is to be acquired neither from books nor tradition, but which is the fruit of largely participating in public affairs; discreet and sagacious, he will enter upon the duties of the office with great advantages." - "Memoir of the Life of John Quincy Adams.", Josiah Quincy.
• European tobaccos are adapted for both cutting and for cigars, and are used extensively at home though not considered equal to American varieties, being of a milder flavor. - "Tobacco; Its History, Varieties, Culture, Manufacture and Commerce", E. R. Billings.