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The discussion about provisions relating to the unilateral termination of contracts becomes controversial already at a terminological level. It has been noted, not only in Polish literature, that the terminology used in this field in various national laws is ambiguous and may be misleading (P.S. Atiyah, An Introduction to the Law of Contract, Oxford 1995, p. 398). The power to unilaterally bring a contract to an end may be defined as the right to terminate, withdraw from, cancel or rescind a contract. Certainly, the unilateral termination of a contract is not as uniform as could be sought-after. Thus, it is important to set out the terminological background before presenting the legislative framework for the unilateral termination of contracts under Polish law.