There are multiple definitions - click on the translation that matches your context.
Substantiv
full
noun
Since mortgages in the US and UK are, by definition, debts that the mortgagee (borrower) pays back over time, this translation is a very close match to the concept of an "amortizing mortgage" (literal translation of "Tilgungshypothek")
an agreement that allows someone to borrow money from a bank or similar organization, most commonly in order to buy a house or other piece of real property
I've been unable to keep up with my monthly mortgage payments
security interest in real property or shares as security for money borrowed; the transfer of legal title of a property, often land, to another as security for payment of a debt
The bank took a mortgage over the borrower's home.
the amount of money loaned under such an agreement
We took out a mortgage for €465 000.