mostly
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mostly
For the most part; almost completely, but not entirely. It describes that something applies to the overwhelming part of a thing or group.
Die Arbeit ist grösstenteils fertig, nur ein paar Details fehlen noch.
The work is mostly finished; only a few details are still missing.
The word is made up of 'größten' (superlative of 'groß' (big/large)) and 'Teils' (genitive of 'der Teil' (part)). So it literally means 'of the largest part.'
Der Erfolg des Projekts war größtenteils sein Verdienst.
The success of the project was mostly thanks to him.
As an adverb, 'größtenteils' (mostly) can stand flexibly in the sentence. It can be in position 1 (then the verb follows) or after the verb in the middle field of the sentence.
Größtenteils waren die Gäste mit dem Service zufrieden.
For the most part, the guests were satisfied with the service.
There are two correct spellings for this word. In Germany and Austria, 'größtenteils' with 'ß' is common. In Switzerland and as an alternative when 'ß' is not available, it is written 'grösstenteils' with 'ss'.
Die Teilnehmenden kamen größtenteils aus Deutschland.
The participants came mostly from Germany.
partly
'teilweise' and 'grösstenteils' both describe that something is not completely whole or complete. The difference lies in the amount. 'teilweise' only says that something applies in part; this part can be small or medium-sized. 'grösstenteils' means that the largest part is affected, so almost everything or most things. Learners may confuse the words because both do not mean 'completely'. As a guide: with 'teilweise', it remains open how large the part is; with 'grösstenteils', it is clearly the majority or the overwhelming part.
Nach dem Umbau ist das Büro grösstenteils fertig, nur die Küche fehlt noch.
After the renovation, the office is mostly finished; only the kitchen is still missing.
Der Zug fällt heute teilweise aus, aber einige Verbindungen fahren noch.
Some train services are canceled today, but some connections are still running.