Of course I have defined the soul several times already on this thread. However, since you are new I will accomodate your question.
The soul is your conscious personality that consists of intellect/mind, emotions and volition. It is your conscious self or the mental, emotional, volitional interaction that goes on inside you. That interaction within is manifested by what you say and do without and so the outward expression is your transparent "life" because as a man thinketh in his heart so is he!
Hence, the soul is what really angers men so that they desire to kill you. It is not your body they are trying to kill, it is what is obnoxious to them - your personality, soul expression through the body. The body simply serves as the vehicle of expression for the soul. Man can kill the body but they cannot kill the soul.
The human "spirit" and "soul" are distinguished from each other by the Word of God (Heb. 4:12; 1 Thes. 5:23) but both are IMMATERIAL substance or spirit as God is spirit in substance.
However, just as the body is the vehicle of expression for the soul, the soul is the vehicle of expression for the spirit. As the soul is the seat of conscious SELF life the spirit is the seat of conscious SPIRITUAL life. It is the spirit of man that enteracts with the spirit world just as the body enteracts with the outerworld. The spirit is the medium through which the spirit world is made conscious to the soul just as the body is the medium through which the outer world is made conscious to the soul. It is through the human spirit that direct revelatory knowledge is made conscious to the soul's mind without study or intellectual activity. It is the spirit that is the seat of the conscience. It is the spirit that is born of the Spirit and where the Spirit of God dwells within the child of God and our spirit bears witness with His Spirit.
When God created man God breathed plural "LIVES" into man - spiritual life, soul life, physical life making man a triune being as one aspect created in the image or likeness of God. The unglorified man is a "living soul" whereas the glorified man is a "living spirit." The distinction is not a matter of substance (spirit, soul and body) but the priority of dominance as the glorified man is no longer "SELF" driven but "Spirit" driven. The "soul" is the seat of SELF-consciousness where mind, emotions and will dominate man. The glorified man is completed subjected to God through his "spirit".
Salvation is three-fold for the whole man.
1. What is born of Spirit is spirit - Past tense "saved" - regeneration/justification - "live in the Spirit"
2. Conscious submission to the spirit (soul) - "save" - progressive sanctification -"walk in the Spirit"
3. This corruptible put on incorrupiton (body) - "shall be saved" - glorification
You still have not explained what a spirit is.