The Spanish word 'adyacente' (meaning 'adjacent') comes from the Latin word 'adiacens', which meant 'lying near' or 'adjacent'. The Latin term was formed by combining two elements: the prefix 'ad-' meaning 'toward' or 'near', and the verb 'iacere' meaning 'to lie' or 'to be situated'. So literally, something that is 'adyacente' is something that 'lies near' to something else.

A related Spanish word is 'yacer' (to lie down, to rest), which comes from the same Latin root 'iacere'. You can see how both words maintain the basic concept of 'lying' or 'position', with 'adyacente' specifically referring to something lying next to something else.

The English word 'adjacent' is a direct cognate of Spanish 'adyacente', as both come from the same Latin source 'adiacens'. Another related English word is 'subjacent' (lying beneath), which uses the same root 'iacere' but with a different prefix 'sub-' (under) instead of 'ad-' (near).