A more thorough explanation:

Definition: To ratify or formalize a treaty, convention, or contract. It can also mean to bind or estop someone, or to sign a contract for the sale of real property.

• The two countries concluded a peace treaty after months of negotiations.
• By signing the contract, the parties concluded their agreement.
• The admissions made by the defendant concluded them as a matter of law.
• In Scotland, when someone agrees to buy a property, they must conclude missives by signing a contract.

These examples illustrate how the term "conclude" can be used in different contexts. In the first example, two countries formally ratified a peace treaty. In the second example, the parties bound themselves to the terms of the contract by concluding it. In the third example, the defendant's admissions had legal consequences that concluded their case. Finally, in the fourth example, someone buying a property in Scotland must sign a contract to conclude the sale.