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plein airor plein-air (plān′âr′, plĕ-nĕr′)
1. Of or being a style of painting produced out of doors in natural light.
2. Taking place outdoors: plein air dining.
[From French (en) plein air, (in) the open air : en, in + plein, full + air, air.]
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.
plein-air(ˌpleɪnˈɛə; French plɛnɛr)
(Art Terms) of or in the manner of various French 19th-century schools of painting, esp impressionism, concerned with the observation of light and atmosphere effects outdoors
[C19: from French phrase en plein air in the open (literally: full) air]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
plein-air(ˌpleɪnˈɛər; Fr. plɛˈnɛr)
1. of or pertaining to a style of impressionist painting seeking to produce the luminous effects of outdoor light.
2. of or pertaining to painting done in daylight out of doors.
[1890–95; < French: literally, open air]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.