Webster's Unabridged Dictionary defines "fellowship" as:

    1. The state of being fellows,sharing,participation,joint experience.
    2. A group of persons united by a common ideal,cause,belief,or interest.

The Zondervan New Compact Bible Dictionary states that "fellowship" is:

    1. That which is in common
    2. Membership in a local Christian church or in the church (Acts 2:42)
    3. A partnership in support of the Gospel and in the charitable work of the church.
    4. That love which fills the hearts of believers,one for another and for God.

From the original Greek language,the word for "fellowship" is "koinonia" meaning: sharing,in common,communion. Of the 15 times "fellowship" is used ,it is translated 12 times from the Greek "koinonia." The other 3 times,it is translated as "communion." In these 3 instances it conveys the meaning:

    1. A partnership,sharing in common, a communion. (2 Cor.10:16,Philem.6)
    2. To be joint partners with. (Eph. 4:11)
    3. To become a partner. (1 Cor 10:20)

From these definitions and the usage of the word "fellowship" in the New Testament,we conclude that:

    1. Fellowship involves spiritual work rather than eating and drinking or any other social         situation. (2 Cor 13:14; Eph 3:9; 1 Cor 10:16; Phil 1:5)
    2. Fellowship is a contribution to a common cause,a common fund and its distribution.
       (Ro 15:26; 2 Cor 8:4)
    3. Christian are to be in fellowship with Jesus Christ and God. (1 Cor 1:9; 1 Jn 1:3;         Phil2:1; Phil 3:10)
    4. Christian are to be in fellowship with each other. (1 Jn 1:7;Gal 2:9;2Cor 8:4;Phil l:S;
       Phil 4:15-17)

Conversely, it follows that Christians cannot have fellowship with:

    1. The devil (1 Cor 10:20;2 Jn 10-11)
    2. Unfruitful works of darkness ( Eph 5:11)
    3. Unrighteousness or darkness (2 Cor 6:14;1 Jn 1:6)
    4. Non-believers or any who would pervert the word of God.(Mat 15:8,9; Mat 7:21,22;
       2 Cor 11:4;Rev 22:18,19)
    5.Those who sow discord,division,or contentiousness.(l Cor l:1O;.Ro 15:5,8;16:17
      1 Cor 3:2-5;Eph 4:1-6).