alfresco: outdoors; outdoor.

adjective: Taking place or located in the open air; outdoor.

Turner escaped from the entangled politics of London's art world, where the Royal Academy was marooned in petty disputes, to paint alfresco on the riverbanks.
--Siri Huntoon, "Down by the Riverside," New York Times, November 7, 1993

Outdoor sitting areas all have LAN connections, so that employees can work alfresco.
--Scott Kirsner, "Digital Competition - Laurie A. Tucker," Fast Company, December 1999

I sailed past alfresco cafes filled with young people reading the paper, past restaurants doing a thriving brunch business, and ended up dropping down a fairly steep hill to the water yet again, on an obscure street that ended near a big factory.
--Gary Kamiya, "An ode to Sydney," Salon, September 27, 2000

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Alfresco is from the Italian al fresco, "in the fresh (air)," from al, "in the" (a, "to, in" + il, "the") + fresco, "fresh."

...or is it still a two-word Italian phrase, and the cited examples from 1993 onward are just people too eager to push something as an English word when it's not?