The vital principle or animating force within living beings.
Incorporeal consciousness.
The soul, considered as departing from the body of a person at death.
The part of a human associated with the mind, will, and feelings: Though unable to join us today, they are with us in spirit.
The essential nature of a person or group.
A person as characterized by a stated quality: He is a proud spirit.

An inclination or tendency of a specified kind: Her actions show a generous spirit.

Guest wrote:

I wonder why the dictionary doesn't use this word: Spirit. What is a spirit? What do you know about spirits?