
zweifach
double
Describes that something consists of two parts or is present in duplicate.
Bitte reichen Sie den Antrag in zweifacher Ausfertigung ein.
Please submit the application in duplicate.
twofold / double
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double
Describes that something consists of two parts or is present in duplicate.
Bitte reichen Sie den Antrag in zweifacher Ausfertigung ein.
Please submit the application in duplicate.

two-time / double
Means that something is twice as large, strong, or intense as normal.
Sie ist zweifache Mutter und hat daher viel Erfahrung mit Kindern.
She is a mother of two and therefore has a lot of experience with children.
The word consists of the number 'zwei' (two) and the ending '-fach'. This ending is attached to numbers to form multipliers, as in 'einfach' (simple/single), 'dreifach' (triple), or 'mehrfach' (multiple).
Für die Prüfung müssen Sie den Stoff mindestens dreifach wiederholen.
For the exam, you must review the material at least three times.
'Zweifach' can stand before a noun as an adjective and is then declined. It can also be used as an adverb to modify a verb or an adjective, and then it remains unchanged.
Das ist ein Formular mit zweifachem Durchschlag.
This is a form with a duplicate carbon copy.
In the meaning 'in duplicate,' 'zweifach' is often used in formal or technical contexts. Typical combinations are 'in zweifacher Ausfertigung' (in duplicate), 'eine zweifache Kopie' (a duplicate copy), or 'ein zweifacher Verschluss' (a double closure/lock).
Der Vertrag muss in zweifacher Ausfertigung unterschrieben werden.
The contract must be signed in duplicate.
When it refers to people, 'zweifach' often describes a repeated role or achievement. Common examples are 'zweifache Mutter' (mother of two), 'zweifacher Vater' (father of two), or 'zweifacher Olympiasieger' (two-time Olympic champion).
Als zweifacher Weltmeister kennt er den Druck vor einem Finale.
As a two-time world champion, he knows the pressure before a final.
double
Doppelt and zweifach can both indicate a quantity or number of two. Doppelt is more common in everyday speech and usually emphasizes a doubling compared with the normal amount, while zweifach more often refers to a formal count or arrangement. Choose the word according to whether the style is everyday or formal.

Bitte reichen Sie den Antrag zweifach bei der zuständigen Stelle ein.
Please submit the application in duplicate to the responsible office.
Dieses Jahr hat die Firma doppelt so viele Bestellungen erhalten wie im letzten Jahr.
This year, the company received twice as many orders as last year.