Dutzend
dozen
A quantity of twelve items.
Ich hätte gern ein Dutzend Eier, bitte.
I'd like a dozen eggs, please.

dozen
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dozen
A quantity of twelve items.
Ich hätte gern ein Dutzend Eier, bitte.
I'd like a dozen eggs, please.

In the singular with an article ('ein Dutzend' — a dozen), the word means the exact number 12. In the plural ('Dutzende' — dozens), it describes an indefinite, larger quantity, similar to 'many'.
Für den Kuchen brauche ich genau ein Dutzend Eier.
For the cake I need exactly a dozen eggs.
When 'Dutzend' (dozen) means the number 12, it is not declined. The following noun is in the plural and usually has no article.
Er kaufte ein Dutzend rote Rosen.
He bought a dozen red roses.
The plural form 'Dutzende' (dozens) is treated like a noun and declined. It can be followed directly by a noun, or the construction 'Dutzende von' (dozens of) + noun can be used.
Er hat Dutzende Bücher zu diesem Thema gelesen.
He has read dozens of books on this topic.
Although in theory you can count anything in dozens, the term is traditionally often used for certain goods. These include especially 'Eier' (eggs), 'Rosen' (roses), 'Brötchen' (bread rolls), or 'Austern' (oysters).
Auf dem Markt kann man frische Austern im Dutzend kaufen.
At the market, you can buy fresh oysters by the dozen.
several
'mehrere' and 'Dutzend' both have to do with quantities, but they work differently. 'mehrere' does not give an exact number and simply means more than two. 'ein Dutzend' (a dozen) is exactly twelve items. In the plural, 'Dutzende' (dozens) often means a larger, indefinite number. Learners may confuse the words because both can sometimes seem imprecise. The important point is: 'mehrere' is a small to medium indefinite quantity; 'Dutzend' either has the fixed number twelve or, in the plural, means a clearly larger quantity.

Für die Feier kauft Paul ein Dutzend Brötchen.
Paul buys a dozen rolls for the party.
In der Besprechung stellte die Mitarbeiterin mehrere Fragen zum neuen Plan.
In the meeting, the employee asked several questions about the new plan.