From Longman Dictionary of Contemporary Englishinterpenetratein‧ter‧pen‧e‧trate /ˌɪntəˈpenətreɪt $ -tər-/ verb [intransitive, transitive] formal SPREADto spread through something or spread through each other —interpenetration /ˌɪntəpenəˈtreɪʃən $ -tər-/ noun [countable, uncountable]→ See Verb table
