I asked a similar question about spirituality here:
I'll cut & paste my interpretation of spirituality:
I define it as subjectively experiencing life both outside of myself but mainly within.
Outside: becoming familiar with the awesomeness of the world be it the magnificent, the delicate hardly noticable, or the beautiful.
Within: My inner reactions to the outer: creation, such as how I feel when I see waves clashing angrily or even a calm ripple, when I hear thunder or say when I see a spider spinning a web or a bird feeding its young. My personal observance of life or how I deal with death or traumatic events, the profound insights that each experience brings. All these, in a nut shell, are part of what make up my spirituality.
Naturally I am aware that a persons theology will play a part in how a person views spirituality, but that is another thread. Mine is a spirituality with an awarness of and a thankfulness towards God for all of these things, for others evolution or whatever their spirituality entails.