The word "contractually" means in accordance with the terms of a contract or agreement. Some synonyms for this word include "legally binding", "by agreement", "in conformity with the contract", "under the terms of the contract" and "in adherence to the agreement". Other words that may be used interchangeably with "contractually" include "obligatorily", "by contract", "in compliance with the agreement" and "as stipulated in the contract." Regardless of the specific word used, all of these synonyms convey the same idea of an obligation or commitment that is legally binding due to a contracted agreement between parties.