verb (used with object), in·ter·pen·e·trat·ed, in·ter·pen·e·trat·ing.
  1. to penetrate thoroughly; permeate.
  2. to penetrate with (something else) mutually or reciprocally.
verb (used without object), in·ter·pen·e·trat·ed, in·ter·pen·e·trat·ing.
  1. to penetrate between things or parts.
  2. to penetrate each other.

Origin of interpenetrate

First recorded in 1800–10; inter- + penetrate
Related formsin·ter·pen·e·tra·ble [in-ter-pen-i-truh-buh l] /ˌɪn tərˈpɛn ɪ trə bəl/, adjectivein·ter·pen·e·trant, adjectivein·ter·pen·e·tra·tion, nounin·ter·pen·e·tra·tive, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for interpenetrate

Historical Examples of interpenetrate

  • They interpenetrate and a change in one affects all the others.

    A Preface to Politics

    Walter Lippmann

  • They interpenetrate, interlace, correspond with and embrace each other.

  • They are akin, they interpenetrate, they mutually aid and complete each other.

  • But those departments over-lap and interpenetrate each other.

  • Present-day man possesses four bodies of increasing fineness, the elements of which interpenetrate.


    Th. Pascal

British Dictionary definitions for interpenetrate


  1. to penetrate (something) thoroughly; pervade
  2. to penetrate each other or one another mutually
Derived Formsinterpenetrable, adjectiveinterpenetrant, adjectiveinterpenetration, nouninterpenetrative, adjectiveinterpenetratively, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for interpenetrate

1809, from inter- + penetrate. Related: Interpenetrated; interpenetrating.

Online Etymology Dictionary, © 2010 Douglas Harper