For Abschluss, if the context is on the physical act of formally concluding or forming a binding document, then this English term is more appropriate since one of its meanings is the act of physically signing and effectuating the document.
There are multiple definitions - click on the translation that matches your context.
the act of carrying out the terms of a court order, a contract or a trust etc
Any dispute in respect of the interpretation or execution of the terms of the present agreement will be resolved exclusively by the Courts of Athens.
the act of getting an officer of the court to take possession of the property of a losing party in a lawsuit (=the judgment debtor) on behalf of the winner (=the judgment creditor), sell it and use the proceeds to pay the judgment
The execution of the judgment should be requested from a competent judge or tribunal in order to carry it into effect.
the action of killing someone as a legal punishment
It is thought that about 100 convicted murderers and other criminals are on death row awaiting execution.