Every quarter is a common phrase that simply means every three months. It is often used in business or finance to refer to the frequency of financial reporting or payments. However, there are several other synonyms that can be used in its place. For example, you could use "quarterly", "every three months", "once every quarter", or "every three-month period". Additionally, you may choose to use more specific language depending on the context of your communication. Regardless of which synonym you choose, it is important to ensure that your audience clearly understands how frequently the action or report will occur.