Used as a gerund meaning 'the act of acknowledging'; functions as an abstract noun.
His acknowledging of their contribution was appreciated.
Его признание их вклада было высоко оценено.
acknowledginggerund / present participle Used attributively or predicatively to describe someone or something that acknowledges.
The acknowledging manager apologized for the mistake.
Признающий ошибку менеджер извинился.