Most semblant is spelled with the IPA phonetic transcription "məʊst ˈsɛmblənt". The word semblant is French in origin and it means "appearing or seeming to be something". In English, semblant is often used in the phrase "semblance of", meaning a small amount or resemblance of something. When adding "most" to the beginning of the word, it becomes a superlative form, meaning "the most appearing or seeming to be something". The spelling follows English phonetic conventions for word formation and pronunciation.
The word semblant comes from the Old French word semblant which means appearance or semblance. It is derived from the Latin word similis, meaning similar or like. The word most is an intensifier used to emphasize or strengthen the meaning of semblant. Therefore, most semblant can be understood as most similar or most alike.