'al fresco' definitions:

Definition of 'al fresco'

From: GCIDE

Fresco \Fres"co\, n.; pl. Frescoes or Frescos. [It., fr. fresco fresh; of German origin. See Fresh, a.]
1. A cool, refreshing state of the air; duskiness; coolness; shade. [R.] --Prior. [1913 Webster]
2. (Fine Arts) (a) The art of painting on freshly spread plaster, before it dries. (b) In modern parlance, incorrectly applied to painting on plaster in any manner. (c) A painting on plaster in either of senses a and b . [1913 Webster]
al fresco in the open air; out of doors; outdoors; as, to dine al fresco. [PJC]