: large in size or amount : very full or complete
an extensive [=comprehensive] reading list
He's had extensive [=considerable] training in this area.
The storm caused extensive damage.
extensive repairs
an extensive series of tests
Cite this Entry
“Extensive.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/extensive. Accessed 18 Apr. 2026.
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