P3 in English dictionary P3 Meanings and definitions of "P3" noun (business) public-private partnership noun (chemistry) period 3 proper (computing) Intel Pentium III proper (computing, dated) Intel 80386, 386 family proper (military, aviation, US) Misspelling of [i]P-3[/i]. more Grammar and declension of P3 P3 (plural P3s) more Sample sentences with "P3" Declension Stem Try again Available translations French Spanish Authors