Per centum is a Latin term that means "by the hundred." However, this term is often replaced with more widely used synonyms in everyday English. Many people use the term "percent" instead of per centum, which has become the standard abbreviation for this term. Another synonym that can be used for per centum is "percentage," which means a proportion represented by a number out of 100. You can also use the word "portion" to refer to a part or fraction of something, often expressed as a percentage. Other alternatives include "rate," "fraction," and "ration." These synonyms can help you better express yourself while talking or writing about percentages.