largely

adverb

1. to a great extent; in great part; generally; chiefly: The plan depends largely on his willingness to cooperate. That is largely incorrect.
2. in great quantity; much.

adverb

1. principally; to a great extent
2. on a large scale or in a large manner

adv.c.1200, “liberally, generously, bountifully;” also “in large measure; abundantly,” from large + -ly (2). Meaning “extensively, to a great extent” is c.1400.