1. commendatory - Noun
2. commendatory - Adjective
Serving to commend; containing praise or commendation; commending; praising.
Holding a benefice in commendam; as, a commendatory bishop.
A commendation; eulogy.
Source: Webster's dictionaryIn addition to his poem, De Vere also contributed a commendatory letter setting forth the reasons why Bedingfield should publish. Source: Internet
The tickets were regarded as commendatory letters. Source: Internet