a noun-forming suffix occurring originally in loanwords from French (buccaneer; mutineer; pioneer) and productive in the formation of English nouns denoting persons who produce, handle, or are otherwise significantly associated with the referent of the base word (auctioneer; engineer; mountaineer; pamphleteer); now frequently pejorative (profiteer; racketeer).Compare -ary, -er2, -ier2.
Origin of -eer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(forming nouns) indicating a person who is concerned with or who does something specifiedauctioneer; engineer; profiteer; mutineer
(forming verbs) to be concerned with something specifiedelectioneer
Word Origin for -eer
from Old French -ier, from Latin -arius -ary
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
suffix meaning "one who" (operates, produces, deals in); anglicized form of French -ier, from Latin -arius, -iarius; cf. -ary.
Online Etymology Dictionary, © 2010 Douglas Harper