Also means
chiefly
Usage Note
hauptsächlich is built on Hauptsache (the main thing) and works mostly as an adverb meaning 'mainly' or 'for the most part'. The element Haupt- ('head, chief') prefixes many nouns, e.g. Hauptstadt (capital).
Examples
"Wir essen hauptsächlich Gemüse."
Natural Translation
We mainly eat vegetables.
Literal Translation
We eat mainly vegetables.

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