Here's a definition of Spirit.

The vital principle or animating force within living beings. Incorporeal consciousness. Considered as departing from the body of a person at death. Spirit The Holy Spirit. A supernatural being, as: An angel or a demon.
A being inhabiting or embodying a particular place, object, or natural phenomenon.
A fairy or sprite.
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." A causative, activating, or essential principle: A mood or an emotional state: The guests were in high spirits. A particular mood or an emotional state characterized by vigor and animation: "sang with spirit." Strong loyalty or dedication: "team spirit." The predominant mood of an occasion or a period: "The spirit of 1776"
The actual though unstated sense or significance of something: the spirit of the law. An alcohol solution of an essential or volatile substance. Often used in the plural with a singular verb.
spirits An alcoholic beverage, especially distilled liquor.

In the original language of the Bible, the word for 'spirit, breath, and life are the same.