In conformity with is a phrase that is commonly used in written and spoken English. It is often used to show that something is in agreement with or follows a particular set of rules, regulations or guidelines. However, there are several other synonyms that can be used in place of "in conformity with" to indicate the same meaning. These include words such as in compliance with, in accordance with, in agreement with, consistent with, in keeping with and in line with. All of these synonyms essentially mean the same thing and can be used interchangeably. It is important to use these synonyms appropriately in order to vary one's writing style and avoid repetitive language.