The Spanish word "año" (meaning "year") comes from the Vulgar Latin "anno", which developed from Classical Latin "annus" (also meaning "year"). This in turn can be traced back to the Proto-Italic form "*atnos". The evolution from Latin "annus" to Spanish "año" shows a common sound change in Spanish where the double 'nn' became palatalized to 'ñ'.

Several common Spanish words are derived from "año", including "anual" (annual), "añejo" (aged, vintage), and "cumpleaños" (birthday, literally "completion of years"). These related words help reinforce the connection to the concept of year and time passing.

English speakers can easily remember "año" by connecting it to several English words that share the same Latin root "annus". These include "annual" (yearly), "anniversary" (yearly commemoration), "perennial" (lasting through years), and "biennial" (occurring every two years). The connection between these English time-related words and the Spanish word for "year" makes it easier to remember its meaning.