# extensive

Pronunciation: say "ik-STEN-siv" US/UK /ɪkˈstɛn.sɪv/, AUS /ɪkˈsten.sɪv/

## Adjective

1. Covering a large area or reaching across a great extent; vast in scope.
   - Simple: Very large in size, or covering a big area.
   - _The estate included extensive gardens and stretches of woodland._
   - _Firefighters struggled to contain the extensive blaze spreading across the valley._
2. Considerable in amount, degree, or range.
   - Simple: Large in amount or number.
   - _His extensive knowledge of medieval history impressed the entire panel._
   - _The committee made extensive changes to the original proposal._
3. Of entropy or a system: such that the entropy of independent systems taken together equals the sum of their separate entropies.
   - Simple: Describing entropy that simply adds up, so separate systems put together have the sum of their entropies.
   - _In the standard theory the entropy is extensive, so two independent systems taken together have the sum of their separate entropies._
   - _The generalized formula keeps the entropy extensive only when its parameter is set to one._

## Other meanings

- (adjective) Serving to extend or lengthen; characterized by extension.

## Origin

This word entered late Middle English from Late Latin "extensivus", which came from Latin "extensus".

Source: DictionaryAI, https://dictionaryai.com/define/extensive (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).