Definition of "complimentary"

complimentary

/ˌkɒmplɪˈmɛnt(ə)ɹi/

adjective
comparative more complimentary, superlative most complimentary
1. In the nature of a compliment.
  Quotations
  But yesterday evening late, when Lewis arrived from down town he found his supper spread, and some presents of books there, with very complimentary writings on the fly-leaves, and certain very complimentary letters, and more or less greenbacks of dignified denomination pinned to those letters and fly-leaves...
  1877 August 25, Mark Twain, The Letters of Mark Twain, volume 3,2004, page 56
2. Free; provided at no charge.
  Quotations
  In the evenings, Ward and PJ offer guests a complimentary drink. This gesture seems to reinforce the hosts' desire to make everyone feel welcome.
  2005, Vivien Lougheed, Belize Pocket Adventures, page 65
3. With respect to the closing of a letter, formal and professional.
  Quotations
  The complimentary closing is the word grouping used to bring the message or text to a close.
  2003, Richard H. Beatty, The Perfect Cover Letter