say it: ik-STEN-siv
extensive is an adjective meaning "large in spatial extent or range or scope or quantity". It carries 3 recorded senses.
broad in scope or content
“across-the-board pay increases”
“an all-embracing definition”
“blanket sanctions against human-rights violators”
“an invention with broad applications”
“a panoptic study of Soviet nationality”
“granted him wide powers”
of agriculture; increasing productivity by using large areas with minimal outlay and labor
“producing wheat under extensive conditions”
“agriculture of the extensive type”
Definitions, synonyms and semantic relations for extensive come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.