Cardinal adjective is a term used in grammar that refers to adjectives that indicate the quantity of a noun. Some synonyms for the cardinal adjective include numerical, quantifiable, numeric, and arithmetical. These adjectives are essential in conveying numerical information and are commonly used in mathematical equations, scientific reports, and financial statements. Other related terms include ordinal adjectives, which indicate the position of a noun in a series, and distributive adjectives, which describe how many items are distributed among a group. Understanding the nuances of these types of adjectives is crucial for effective communication and precision in writing.