Definition of cordially adverb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. The meaning of CORDIAL is showing or marked by warm and often hearty friendliness, favor, or approval : politely pleasant and friendly. How to use cordial in a sentence. Did you know? Synonym Discussion of Cordial. CORDIAL meaning: 1. friendly, but formal and polite: 2. (of a feeling, especially dislike) strongly felt: 3. a…. Learn more. The adverb cordially comes from the adjective cordial, which come from the Middle Latin word cordialis meaning "of or for the heart." Something that is done cordially has warmth and friendliness to it, like a host who greets people cordially at a party.