The phrase "once a quarter" can be replaced with several synonyms, including "every three months," "quarterly," "four times a year," and "once per season." These phrases all refer to a recurring event or action that happens every three months, typically related to business or financial activities, such as earnings reports or budget reviews. Using different synonyms can add variety and clarity to language, helping to avoid repetition and monotony. In addition, it can help to ensure that everyone understands the frequency and timing of the activity or event, reducing confusion or miscommunication.