P1 Syllabification: (P)Pronunciation: /pē/ (also p)Translate P | into French | into German | into Italian | into Spanish Definition of P noun (plural Ps or P's /pēz/) the sixteenth letter of the alphabet. denoting the next after O (or N if O is omitted) in a set of items, categories, etc.. Phrases mind one's Ps and Qs see mind.P in other Oxford dictionaries Definition of P in the British & World English dictionary