Forming an arch overhead or above: overarching branches.
Extending over or throughout: "I am not sure whether the missing ingredient . . . is surprise or an overarching radiance” ( John Simon).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.