PASabbr. para-aminosalicylic acidpas (pä)n. pl. pas (pä) 1. A step or dance.2. The right to go before; precedence.[French, from Old French, from Latin passus, step; see pace1.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.pas (p??; French p?) n, pl pas (p??z; French p?) 1. (Ballet) a dance step or movement, esp in ballet2. rare the right to precede; precedence[C18: French, literally: step]PAS abbreviation for (Medicine) physician-assisted suicide: a practice in which a terminally-ill person requests a medical practitioner to administer a lethal dose of medication Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014pas (p?) n., pl. pas (p?, p?z) 1. a step or series of steps in ballet. 2. right of precedence. [1695?1705;