The Spanish word 'mesetario' (relating to a plateau) has an interesting evolution that starts with the Latin word 'mensa' meaning 'table'. This developed into the Spanish word 'mesa', keeping the same meaning of 'table'. The word then combined with the Spanish diminutive suffix '-eta' to form 'meseta', which came to mean 'plateau' - essentially a large, flat elevated area that resembles a table in its flat surface. Finally, the adjective suffix '-ario' was added to 'meseta' to create 'mesetario', meaning 'relating to a plateau'.

This is a great example of how metaphorical extension can create new meanings: the flat surface of a table ('mesa') became associated with the flat surface of a raised landform ('meseta'), and then an adjective was derived from this noun.

The most common related Spanish word is 'mesa', meaning 'table', which is much more frequently used in everyday Spanish. You'll also encounter 'meseta' quite often in geography contexts, referring to a plateau or tableland. If you know these words, it's easier to understand that 'mesetario' simply means 'relating to a plateau'.

While English doesn't have any direct cognates from the Latin 'mensa', we do use the word 'mesa' as a loanword from Spanish, particularly in the southwestern United States, to refer to a distinctive type of plateau with steep sides. This is the same concept as the Spanish 'meseta', just applied to a specific geographic feature. The English word 'mensa' (as in the high IQ society) comes from the same Latin root, though it's not commonly used outside this context.