Today, testimonial is most often used to refer to a statement—such as one posted on any number of websites devoted to consumer reviews—that endorses a product or service. Examples are automatically compiled from online sources to show current usage. Read More. testimonial meaning, definition, what is testimonial: a formal written statement describing so...: Learn more. Learn the meaning of testimonial as a formal written statement or a thing that shows appreciation. Find out how to pronounce it and see example sentences and synonyms. Learn the English definition and meaning of Testimonial with examples, pronunciation, and translations to enhance your vocabulary.