WordReference Random House Unabridged Dictionary of American English © 2026
in•ter•pen•e•trate  (in′tər peni trāt′),USA pronunciation v. -trat•ed, -trat•ing. 
v.t. 
  1. to penetrate thoroughly; permeate.
  2. to penetrate with (something else) mutually or reciprocally.

v.i. 
  1. to penetrate between things or parts.
  2. to penetrate each other.
  • inter- + penetrate 1800–10
in•ter•pen•e•tra•ble  (in′tər peni trə bəl),USA pronunciation adj.  in′ter•pene•trant, adj. 
in′ter•pen′e•tration, n. 
in′ter•pene•tra′tive, adj. 

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