/ ˌtestɪˈməʊniəl; NAmE -ˈmoʊ-/ noun
1.
a formal written statement, often by a former employer, about sb's abilities, qualities and character; a formal written statement about the quality of sth :
a glowing testimonial
The catalogue is full of testimonials from satisfied customers.
2.
a thing that is given or done to show admiration for sb or to thank sb :
a testimonial game (= to raise money for a particular player)
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WORD ORIGIN
late Middle English : from Old French testimonial testifying, serving as evidence, from late Latin testimonialis , from Latin testimonium , from testis a witness.