Prayer is necessary in a Christian. Prayer is power. Learn here the 5 major importance of prayer in a Christian life. Get connected to God now. Prayer may be defined as: 1. A sincere petition or request to a particular deity. 2. The act of praying. 3. Words utilized for a serious request. 4. Religious and wordless union with God. All 4 are excellent definitions, but “Religious and wordless union with God” seems to be the perfect one. I think it is the true definition of prayer!