zugunsten

See also: zu Gunsten

German

Univerbation of zu +‎ Gunsten, from Gunst (“favor”).

zugunsten (governs the genitive)

in support of, in favor of
Antonym: zuungunsten

zugunsten des Käufers ― for the benefit of the purchaser

zugunsten (governs the dative)

(uncommon, dated) in support of, in favor of
dem Leser zugunsten ― for the benefit of the reader

The spelling zugunsten was deprecated in 1996 in the German spelling reform of 1996 (the Rechtschreibreform).
The spelling zugunsten has been an optional spelling since the German spelling reform of 1996 (the Rechtschreibreform) as of 2006.
Pronouns are often used with zu and Gunsten as separate words, with a possessive pronoun in the middle and governed by zu in the dative: zu seinen Gunsten (“in his favor”).