A direct relative of "mundane" meaning world
Encoding Strategies:
linguistic

mundane
of this world
+
-o
noun suffix
Mundo turns the English word mundane0 into a noun. Though we use "mundane" to mean ordinary or dull, it literally means of this world0 — and worldly things, as opposed to the spiritual, are seen as common and unremarkable. So mundo means world.
mundo
world, planet
The planet Earth or any other planet.
- Es el río más largo del mundo = It's the longest river in the world
- Los científicos buscan otros mundos habitables = Scientists search for other habitable worlds
world (humanity)
All of humanity — everyone on Earth.
- El mundo entero vio la transmisión en vivo = The entire world watched the live broadcast
world (domain / sphere)
A particular sphere or domain of life or activity.
- Trabaja en el mundo de la moda = She works in the fashion world
world (secular life)
Worldly or secular life, as opposed to the spiritual or religious. Fittingly, this is exactly the sense that gave us the English word "mundane."
- Dejó el mundo para hacerse monje = He left the world behind to become a monk
life experience, worldliness (worldliness)
The experience and savvy that comes from living in the world and dealing with people.
- Tiene mucho mundo para su edad = She has a lot of life experience for her age
todo el mundo
everyone, everybody
Literally "all the world" — used to mean everyone.
- Todo el mundo sabe que eso no es verdad = Everyone knows that isn't true