| Term | Definition |
| interloper | One who intrudes by meddling or trespassing on the rights of others |
| internecine | Very destructive to both sides in a conflict; involving slaughter and carnage |
| interpolate | To insert or add something between other parts, especially in a text or written work |
| interregnum | Any period of time when a state is without a ruler or has a provisional government, especially between the reign of a sovereign and a successor |
| interpose | To insert between parts of something; to interject in a conversation |
| juxtapose | To place side by side |
| propinquity | Nearness; proximity |
| rapprochement | Reconciliation; restoration of cordial relations, especially between two countries |
| quiescent | At rest; dormant; motionless |
| acquiesce | To agree or consent without any objection |
| requiem | A mass or service for the repose of departed souls; music, poetry, or other composition for the dead |
| unrequited | Not reciprocal; not given in payment or returned in kind |
| abstruse | Difficult to understand; complex |
| extrude | To push or thrust out a liquid or malleable substance that retains or solidifies into a predetermined shade |
| obtrude | To force one's ideas or oneself insistently upon others |