TESTIMONIAL meaning: 1 : a written or spoken statement in which you say that you used a product or service and liked it; 2 : a written or spoken statement that praises someone's work, skill, character, etc. testimonial meaning, definition, what is testimonial: a formal written statement describing so...: Learn more. Definition of testimonial. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels. A testimonial is a statement in support of a truth, fact, or claim, or a written affirmation of another's character or worth. It can also be a tribute given for services or achievements, or a sports match to raise money for a player.