Dernier is a French word that is commonly used to mean "final" or "last." There are several synonyms for dernier that can be used in different contexts to convey the same meaning. Some of the synonyms include ultimate, final, endmost, conclusive, eventual, and terminal. Ultimate implies the last in a progression or the final thought. Final emphasizes the conclusion of a process or event. Endmost suggests the utmost limit of something. Conclusive suggests closure or decisiveness. Eventual emphasizes the ultimate outcome or result. Terminal implies finality in the sense of a disease or a point of no return. Overall, the synonyms for dernier can be used interchangeably to mean the final or last in a sequence or event.