There are multiple definitions - click on the translation that matches your context.

wesentliche Bestandteil eines Grundstücks (oder Gebäudes)

Substantiv

partial

fixture

noun

Comparative law notes

Germany

Unless the integral element is a right in a land parcel (easement, hereditable building right, etc.) - see sec. 96 of the BGB - this English term is the best translation.

Definitions of fixture

English

(usually plural) a thing attached to real property that is considered legally part of it and normally included when the real property is sold

The fixtures include a built-in swimming pool behind the house.