cordially

cordial +‎ -ly

• (General American) IPA^(key): /ˈkɔɹdʒəli/
• (Received Pronunciation) IPA^(key): /ˈkɔːdɪəli/
• Hyphenation: cor‧dial‧ly

cordially (comparative more cordially, superlative most cordially)

1. In a cordial, warm or friendly manner.
   • 1893, London, Royal Geographical Society, The Geographical Journal

     I may ask you, then, cordially to thank Sir George Goldie for all that he has done for the Society.

   • 1898, Ivan Sergeevich Turgenev, Tourguéneff and his French Circle

     My dear Monsieur Durand,—I am sending you[....]

     Ever most cordially yours,

     Iv. Tourguéneff.

As indicated above, the term is often used in letter closings.