The spirit comes into play when you don't see uke as the enemy but as another self. When you don't see that those that disagree with you as seperate or wrong. When you don't think that you are more or less human than others. Aikido shows us all that.
But that would mean spirit is a thing of oneness, of unity, of harmony, of universal love, of co-existence, of blending, of Ki, of granting others the right to be, of.......