Also means
circle, milieu
Usage Note
Mundillo is a diminutive of mundo (world) but has fully lexicalized to mean a small, closed professional or social circle — e.g. el mundillo del cine (the film world). It carries a slightly ironic flavour, suggesting the group is insular or self-important. Never used for the literal physical world.
Examples
"Es muy conocido en el mundillo literario."
Natural Translation
He is very well known in literary circles.

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