interpenetrate UK /ɪntəˈpɛnɪtɹeɪt/US /ɪntɚˈpɛnətɹeɪt/ verb2 •To penetrate mutually or reciprocally. •To permeate or pervade.It interpenetrates my granite mass, / Through tangled roots and trodden clay doth pass, / Into the utmost leaves and delicatest flowers; [...] — 1818 formsinterpenetrated · interpenetrating · interpenetrates