Русско-англо-русский юридический словарь

GRATUITOUS CONTRACT, civ. law. One, the object of which is for the benefit of the person with whom it is made, without any profit, received or promised, as a consideration for it as, for example, a gift. (A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. )

The English requirement for consideration does not apply in Scotland, so it is possible to have a gratuitous contract, i.e. a contract where only one of the parties comes under any duties to the other (e.g. a contract to perform services for no consideration). If, however, consideration is given, as for example in a sales contract, the contract is said to be onerous. (Wikipedia)