H1 Syllabification: (H)Pronunciation: /āCH/ (also h)Translate H | into French | into German | into Italian | into Spanish Definition of H noun (plural Hs or H's /ˈāCHiz/) 1the eighth letter of the alphabet. denoting the next after G in a set of items, categories, etc.. (h) Chess denoting the file on the right-hand edge of the board, as viewed from White’s side. 2 (H) a shape like that of a capital H. 3 (H) Music (in the German system) the note B natural. H in other Oxford dictionaries Definition of H in the British & World English dictionary