die Mehrzahl
majority
The largest part of a group of people or things; the majority.
Die Mehrzahl der Befragten sprach sich für die neue Regelung aus.
The majority of respondents spoke in favor of the new regulation.

majority / plural
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majority
The largest part of a group of people or things; the majority.
Die Mehrzahl der Befragten sprach sich für die neue Regelung aus.
The majority of respondents spoke in favor of the new regulation.

The word 'Mehrzahl' is composed of 'mehr' (more) and 'Zahl' (number). It literally means a 'larger number' or 'amount', which fits both meanings.
Die Mehrzahl der Stimmen entschied die Wahl.
The majority of the votes decided the election.
You can recognize the meaning from context. If you are talking about groups of people or things, it means 'Majorität' (majority). If you are talking about grammar and words, it means 'Plural' (plural).
Die Mehrzahl der Anwohner ist gegen den Bau der neuen Straße.
The majority of residents are against the construction of the new road.
In the meaning of 'Majorität' (majority), 'die Mehrzahl' often appears with 'von' and a noun in the plural. Although 'Mehrzahl' is singular, in colloquial German the verb after it is often in the plural, referring to the group.
Die Mehrzahl der Gäste sind schon gegangen.
The majority of the guests have already left.
This meaning of 'Mehrzahl' is used exclusively in the context of language and grammar to name the plural form of a noun.
Im Deutschunterricht lernen wir heute, wie man die Mehrzahl bildet.
In German class today, we are learning how to form the plural.
majority
'die Mehrheit' and 'die Mehrzahl' can both mean the largest part of a group. In many sentences they are very similar: 'die Mehrheit der Gäste' and 'die Mehrzahl der Gäste' mean almost the same thing. 'Mehrheit' is used especially often for votes, opinions, and politics. 'Mehrzahl' sounds a little more general and works well when you are simply saying that most people or things belong to a group. They are easy to confuse because in this meaning they are almost the same. Careful: 'Mehrzahl' can also be a grammar term for the plural, but that is not what is meant here.

Die Mehrzahl der Besucher kam schon am Vormittag.
The majority of visitors arrived in the morning.
Die Mehrheit der Eltern stimmt dem neuen Stundenplan zu.
The majority of parents agree with the new timetable.