WordReference Random House Unabridged Dictionary of American English © 2026
in•ter•pen•e•trate
(in′tər pen′i trāt′),USA pronunciation v. -trat•ed, -trat•ing.
v.t.
v.i.
in•ter•pen•e•tra•ble
(in′tər pen′i trə bəl),USA pronunciation adj.
in′ter•pen′e•trant, adj.
in′ter•pen′e•tra′tion, n.
in′ter•pen′e•tra′tive, adj.
v.t.
- to penetrate thoroughly; permeate.
- to penetrate with (something else) mutually or reciprocally.
v.i.
- to penetrate between things or parts.
- to penetrate each other.
- inter- + penetrate 1800–10
in′ter•pen′e•tra′tion, n.
in′ter•pen′e•tra′tive, adj.