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Most contracts have conditions.
But a more precise definition is that a condition is an event that has to occur before one or both parties must perform. A condition can be a promise. On the other hand, many conditions involve uncertain events not under the direct control of the parties to the contract. Thus neither of them can promise anything about the condition, but the conditions still must be fulfilled for the contract to go forward. Examples are conditioning a home purchase on obtaining financing, on the sale of the buyer's present home, or on an acceptable home inspection report.