What word did I pick? Well, didn’t you read the title?
Zenith showed up in the late fourteenth century, coming from the Old French cenith and Medieval Latin cenit/senit. It’s believed that cenit/senit is an error in the transliteration (translating a word by its letters rather than its definition) of the Arabic word samt, which means road or path. No word as to why it means peak, though.
Sooooo. We end on a mystery. I guess that’s okay. Thanks for reading all these!
University of Texas at Austin Linguistic Research Center