As per your query, Relinquishment deed is a legal document / instrument where a person legally or formally gives up or releases his legal rights of the said property being relinquished in the name of some other person i.e in short meanings to give up or release ones share of an immovable property in the name of some other person. This is one of the modes of transferring of immoveable property.
As a relinquishment deed is an legal instrument / document by which a person formally gives up his claim to another person, the said deed must be systematically executed and registered as per law depending upon the needed compliances as per the statutory governance.
Kindly note that one needs a good property lawyer for systematic legal compliances and needed documentations for drafting / making relinquishment.
Hope this should suffice your query in brief.