This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Not involving a server; composed only of clients.

"In this live Webcast, you'll hear how IT organizations are gaining the ability to completely virtualize their branch office operations, achieving a "serverless" state that eliminates redundant hardware and software, while slashing maintenance costs and IT complexity."