This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Forming an arch overhead or above: overarching branches.

adj. Extending over or throughout: "I am not sure whether the missing ingredient . . . is surprise or an overarching radiance” ( John Simon).

v. Present participle of overarch.

adj. That forms an overhead arch

adj. all-embracing or overwhelming

adj. Forming an arch (over something).

adj. Dominating or overshadowing all other considerations.

"Braun's financial advisers offered additional information about her CMB One Corp., which they described as the overarching company she has set up to handle everything from her public speaking income to her fledgling organic foods business."

overarch