| 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 give 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 shape |
| obtrude | to force one's ideas or oneself insistently upon others |
| altercation | a noisy quarrel |
| altruism | concern for the welfare of others; unselfishness |
| ephemeral | lasting for a very short time (literally, for one day); transitory; not everlasting |
| epitaph | an inscription on a tombstone in memory of the person buried there; a brief (literary) summary of a dead person's life |
| epitome | a typical representation of something; a person who embodies a quality |
| eponymous | referring to the name of a person, mythical being, or a literary figure associated with something, or to a ward incorporating the name of such a person |
| paradigm | an example serving to illustrate a process, pattern, or concept |
| paradox | a statement that seems contradictory but contains a truth or valid deduction |
| paragon | a model of excellence or perfection |
| parameter | in mathematics, a constant that has variable values and is used to determine other variables |
| peripatetic | walking or traveling about |
| peripheral | pertaining to the boundary of an area |
| anathema | a person or thing detested and shunned |
| antithesis | an exact opposite; a complete contrast |
| epithet | a word or phrase used positively or negatively that characterizes or describes a person or thing, added to or replacing a name |