• (America) IPA: /ɛksˈtɛn.sɪv/


  1. having a great extent; covering a large area; vast
  2. (figurative) considerable in amount.
    I have done extensive research on the subject.
  3. Serving to extend or lengthen; characterized by extension
    • 1646, Thomas Browne, Pseudodoxia Epidemica
      For station is properly no rest, but one kind of motion, relating unto that which physicians (from Galen) do name extensive or tonical; that is, an extension of the muscles and organs of motion, maintaining the body at length, or in its proper figure.
  4. (physics) Having a combined system entropy that equals the sum of the entropies of the independent systems.
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