The term "raison-d'etre" refers to the primary reason or purpose of something's existence. In other words, it is the fundamental justification for its being. Synonyms for "raison-d'etre" might include "primary goal," "chief aim," "essential purpose," "central objective," or "core reason." These words all convey the idea of something being necessary or important for a specific outcome or objective. Additionally, terms like "foundation," "underlying principle," or "cornerstone" could also be used to describe the fundamental aspect of something's existence. Overall, the synonyms for "raison-d'etre" emphasize the essential nature of something and its integral role in achieving a particular goal or purpose.
