
überwiegend
predominantly
For the most part; mainly or chiefly.
Die Teilnehmer der Konferenz waren überwiegend Wissenschaftler.
The participants at the conference were predominantly scientists.
predominantly
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predominantly
For the most part; mainly or chiefly.
Die Teilnehmer der Konferenz waren überwiegend Wissenschaftler.
The participants at the conference were predominantly scientists.
'Überwiegend' (predominantly) is the present participle of the verb 'überwiegen'. This verb means 'to weigh more heavily' or 'to dominate'. So 'überwiegend' literally means 'having the most weight'.
Die Vorteile dieser Methode überwiegen deutlich.
The advantages of this method clearly outweigh the disadvantages.
Most of the time, 'überwiegend' (predominantly) is used as an adverb and then remains unchanged in the sentence. Less commonly, it is used as an adjective before a noun and then has to be declined.
Das Publikum bestand überwiegend aus jungen Leuten.
The audience consisted predominantly of young people.
The word 'überwiegend' (predominantly) belongs more to written language and factual contexts. It is often found in reports, news, or academic texts to describe a main tendency.
Die Exporte bestehen überwiegend aus Maschinen und Fahrzeugen.
The exports consist predominantly of machinery and vehicles.
mainly
Hauptsächlich and überwiegend both indicate that something makes up the largest or most important part. Hauptsächlich tends to emphasize the focus, whereas überwiegend points more strongly to an actually large numerical share. Use hauptsächlich for the focus and überwiegend when there is a clear majority.

Der Kurs wird überwiegend von Berufstätigen besucht, die fast drei Viertel der Teilnehmenden ausmachen.
The course is attended predominantly by working professionals, who make up almost three quarters of the participants.
Der Kurs wird hauptsächlich von Berufstätigen besucht, richtet sich aber auch an Studierende.
The course is attended mainly by working professionals, but it is also open to students.