def·er·en·tial I. \|defə|renchəl\adjective Etymology: from deference, after such pairs as English prudence: prudential 1.: showing or expressing deference < listened with deferential attention > < a deferential bow > 2.: given to deference < the deferential nature of society — J.G.Pearson > • def·er·en·tial·ly\-ch(ə)lē, -li\adverb II. adjective Etymology:deferent (II) + -ial : deferent II 2