Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

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 &c 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. V. lie between, come between, get between; intervene, slide in, interpenetrate, permeate. put between, introduce, import, throw in, wedge in, edge in, jam in, worm in, foist in, run in, plow in, work in; interpose, interject, intercalate, interpolate, interline, interleave, intersperse, interweave, interlard, interdigitate, sandwich in, fit in, squeeze in; let in, dovetail, splice, mortise; insinuate, smuggle; infiltrate, ingrain. interfere, put in an oar, thrust one's nose in; intrude, obtrude; have a finger in the pie; introduce the thin end of the wedge; thrust in &c (insert) 300. Adj. interjacent†, intercurrent†, intervenient†, intervening &c v., intermediate, intermediary, intercalary, interstitial; embolismal†. parenthetical, episodic; mediterranean; intrusive; embosomed†; merged. Adv. between, betwixt; twixt; among, amongst; amid, amidst; mid, midst; in the thick of; betwixt and between; sandwich-wise; parenthetically, obiter dictum.