A creationist here once showed me a definition of "spiritual" that said "having to do with consciousness". But it is kinda confusing, though, since it most often is taken to mean having to do with the supernatural.
Main Entry: 1spir·i·tu·al
Pronunciation: 'spir-i-ch&-w&l, -i-ch&l, -ich-w&l
Function: adjective
Etymology: Middle English, from Middle French & Late Latin; Middle French spirituel, from Late Latin spiritualis, from Latin, of breathing, of wind, from spiritus
Date: 14th century
1 : of, relating to, consisting of, or affecting the spirit : INCORPOREAL
2 a : of or relating to sacred matters b : ecclesiastical rather than lay or temporal
3 : concerned with religious values
4 : related or joined in spirit
5 a : of or relating to supernatural beings or phenomena b : of, relating to, or involving spiritualism : SPIRITUALISTIC