al·fres·co (āl-frěs'kō) adv. In the fresh air; outdoors: dining alfresco. adj. Taking place outdoors; outdoor: an alfresco conference.
[Italian al fresco, in the fresh (air) : al, in the (a, to, in from Latin ad; see ad- + il, the from Latin ille; see al-1 in Indo-European roots) + fresco, fresh.]