a combining form meaning “all,” occurring originally in loanwords from Greek (panacea; panoply ), but now used freely as a general formative (panleukopenia; panorama; pantelegraph; pantheism; pantonality ), and especially in terms, formed at will, implying the union of all branches of a group (Pan-Christian; Panhellenic; Pan-Slavism ). The hyphen and the second capital tend with longer use to be lost, unless they are retained in order to set off clearly the component parts.
Also, pant-, panto-.

< Greek pan- combining form of pâs (neuter pân) all, every, pân everything Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
combining form
1.  all or every: panchromatic
2.  including or relating to all parts or members: Pan-African; pantheistic
[from Greek pan, neuter of pas all]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

prefix meaning "all, whole, all-inclusive," from Gk. pan-, combining form of pas (neut. pan, masc. and neut. gen. pantos) "all," of unknown origin. Commonly used as a prefix in Gk., in modern times often with nationality names, the first example of which seems to have been Panslavism (1846, q.v.). Also
panislamic (1881), pan-American (1889), pan-German (1892), pan-African (1900), pan-European (1901), pan-Arabism (1930).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pan- pref.

  1. All: panagglutinins.

  2. General; whole: panimmunity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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