"Altar" - Latin "altare" - "elevation," "that which is higher from the earth," close to the meaning of the word "altar.
"Altar" is a symbol of God's Word, His Will.
Laying on the "Altar" is a symbol of truly understanding and doing the Will of God as expressed in the Ten Commandments, which is the true "Sacrifice" that one must give, bring to God.
It is also a selfless act of service for the benefit of enlightening others with the Holy Spirit of God's Word.
Negative Meaning:
"Altar," is a symbol of a false religious, cultic system of worshiping God by representatives of various false beliefs, religious dogmas.