
mehrere
several
Describes an indefinite number of people or things that is greater than two but not a very large amount; some.
Bei dem Unfall wurden mehrere Autos beschädigt.
Several cars were damaged in the accident.
several
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several
Describes an indefinite number of people or things that is greater than two but not a very large amount; some.
Bei dem Unfall wurden mehrere Autos beschädigt.
Several cars were damaged in the accident.
The word 'mehrere' (several) is used exclusively with plural nouns. There is no singular form.
Mehrere Kinder spielen auf dem Spielplatz.
Several children are playing on the playground.
'Mehrere' (several) is declined like an adjective in the plural. The ending adapts to the case of the noun it accompanies.
Mehrere Zeugen haben den Vorfall beobachtet. (Nominativ)
Several witnesses observed the incident. (Nominative)
'Mehrere' (several) can also stand alone and replace a noun when it is clear from the context what it refers to. In this case, it is capitalized if it appears at the beginning of a sentence.
Nicht alle waren einverstanden, aber mehrere stimmten zu.
Not everyone agreed, but several agreed.
some / several
Einige and mehrere, the usual form of mehrer, both refer to an indefinite, not very large number. Einige often sounds less precise and can mean a smaller amount; mehrere makes it clearer that there are more than two people or things.

Nach dem Vortrag hatte ich noch mehrere Fragen, nämlich vier.
After the lecture, I still had several questions, four to be exact.
Nach dem Vortrag hatte ich noch einige wenige Fragen.
After the lecture, I still had a few questions.