This is the 7324th most frequent Portuguese word.
marco
"Marco" in English means "milestone" or "landmark."
Here, 'marco' is used metaphorically to signify an important milestone or event in history.
A descoberta da América foi um marco na história mundial.
The discovery of America was a landmark in world history.
Here, 'marco' means a marker or a sign indicating a location on the map.
Coloquei um marco no mapa para indicar onde estamos.
I marked the map to indicate where we are.
In this case, 'Marco' is used as a proper noun, a given name for an individual.