I learned that día and dios are related while looking into the topic of masculine nouns that end in -a. Día is the most common of these words — we use it every day in Buenos días (note the masculine buenos).
To find the relationship between día and dios you have to go back to Proto-Indo-European (PIE), the language that was the ancestor of Latin, and hundreds of other languages from Gaelic to Gujarati. Día comes from Latin diēs, which is in turn derived from PIE *diéus, meaning ‘Sky-god’ or ‘daytime sky’. Dios comes from Latin deus, from PIE *deiuós ‘God’. These PIE roots are related to many familiar words. *Diéus is the root of both Zeus and Jupiter (the first syllable is the related bit). English words related to *deiuós include demon (that’s ironic), diva, and Tuesday.
The connection between the two PIE roots, *diéus and *deiuós, is too technical for me to really understand because I’m not an PIE expert. However, I know such an expert, Cornell linguistics professor Michael Weiss. He explained to me that *deiuós ‘god’ was derived from the word for ‘sky’ via a common PIE process of vowel affixation referred to by its Sanskrit name, vr̥ddhi. (This is a simplification of his explanation, and I hope I got it right.) As Professor Weiss is the author of the formidable Outline of the Historical and Comparative Grammar of Latin I am more than happy to take his word for it.
Incidentally, the fact that día comes from the name of the sky god — a masculine deity — explains its masculine gender. Its -a ending is another story, hopefully one I’ll have time to tell soon.
Recently I’ve been playing with John Slocum’s terrific Indo-European Lexicon website and wishing I’d discovered it earlier. In case you didn’t know, Spanish and the other Romance languages are part of the Indo-European language family. Other branches of this enormous family include Germanic, Greek, Celtic, Slavic, and Indo-Iranian. Spanish is therefore related to language as diverse as Gaelic and Gujarati; to Sanskrit, Serbian, and Swedish; to Pashto, Persian, and Polish; and to Hindi and Hittite.
Dr. Slocum’s Lexicon lets you trace vocabulary roots up and down the Indo-European family tree. For example, let’s say you’re curious about the origin of the Spanish word pan “bread”. If you click on the Language Index you can then scroll down to Spanish. (For a shortcut, you can access the Spanish page here.) This page lists almost 500 Spanish words whose Indo-European roots are included in the Lexicon. Pan is traced back to the Proto-Indo-European root pā-. Click on that root and you’ll move up the tree, to an entire page devoted to pā-. This page provides a definition and a list of the root’s descendants in all ten branches of the Indo-European family.
It turns out that pan is related to several sets of English words. I knew about some of them, but not all.
- food and fodder
- company, companion
- forage, foray, foster
- pantry, pannier
- pastor, pasture, repast, pastern, pester
- antipasto (but not “pasta”, go figure)
For other words, though not pan, tracing a root back down the tree can show you surprising connections within Spanish. For example, llama “flame” and blanco “white” share the same Indo-European root, as do armisticio, arrestar, asistir, costar, estado, and estar.
Why are you still reading? Run along and play!