Also means
primarily
Usage Note
Principalmente is a formal adverb used to indicate the chief or primary element among several. It typically appears before or after the verb or at the start of a clause. Synonyms include sobre todo (above all) and ante todo (first and foremost), which are more colloquial.
Examples
"El problema afecta principalmente a los jóvenes."
Natural Translation
The problem mainly affects young people.
Literal Translation
The problem affects mainly to the young

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