The action of penetrating between or among.

Roget 294: ingress; entrance, entry; introgression; influx, intrusion, inroad, incursion, invasion, irruption; ingression; penetration, interpenetration; illapse^†, import, infiltration; immigration; admission etc. (reception) 296; insinuation etc. (interjacence) 228^†; insertion etc. 300.    inlet; way in; mouth, door, etc. (opening) 260; barway^†; path etc. (way) 627; conduit etc. 350; immigrant.    ... show more

Mutual penetration; diffusion of each through the other.

synonym: permeation.

Roget 228: interposition, interjacence^†, intercurrence^†, intervenience^†, interlocation^†, interdigitation, interjection, interpolation, interlineation, interspersion, intercalation.    [interposition at a fine-grained level] interpenetration; permeation; infiltration.    [interposition by one person in another's affairs, at the intervenor's initiative] intervention, interference; intrusion, obtrusion; insinuation.    insertion etc. 300; dovetailing; embolism.    intermediary, intermedium^†; go between, bodkin^†, intruder, interloper; parenthesis, episode, flyleaf.    partition, septum, diaphragm; midriff; dissepiment^†; party wall, panel, room divider.    halfway house.    ... show more

Roget 302: passage, transmission; permeation; penetration, interpenetration; transudation, infiltration; endosmose exosmose^†; endosmosis [Chem]; intercurrence^†; ingress etc. 294; egress etc. 295; path etc. 627; conduit etc. 350; opening etc. 260; journey etc. 266; voyage etc. 267.    ... show more