It easy to see that man acts differently from all other creatures. A spirit is non-corporeal, i.e., not made of matter. The cancellation of sin. Expiation and propitiation are similar but expiation does not carry the implication of dealing with wrath, of appeasing it through a sacrifice. Generally speaking, propitiation cancels sin and deals with God's wrath.
Expiation is simply the cancellation of sin.
It is synonymous with trust. Fast, Fasting Depriving oneself of food for a period of time for a specific purpose, often spiritual. Fellowship implies sharing common interests, desires, and motivations. Fellow requires that time be spent with another communicating, caring, etc. It carries with it a hint of intimacy.