What defines fellowship?

Baker's Evangelical Dictionary of Biblical Theology said:

Fellowship

the fact and experience of Christian fellowship only exists because God the Father through Jesus Christ, the Son, and by/in the Spirit has established in grace a relation (a "new covenant") with humankind. Those who believe the gospel of the resurrection are united in the Spirit through the Son to the Father. The relation leads to the reality of relatedness and thus to an experienced relationship (a "communion") between man and God. And those who are thus "in Christ" (as the apostle Paul often states) are in communion not only with Jesus Christ (and the Father) in the Spirit but also with one another. This relatedness, relationship, and communion is fellowship.

General Background. In the colloquial Greek of the New Testament period, koinonia [koinwniva] was used in several ways. It was used of a business partnership, where two or more persons share the same business and are thus closely connected in work. Also it was used of marriage, of the shared life of two persons, a man and a woman, together. Further, it was sometimes used of a perceived relatedness to a god, such as Zeus. Finally, it was used to refer to the spirit of generous sharing in contrast to the spirit of selfish acquiring.
Much of the use of the word group— koinonia [koinwniva], koinonein [koinwnevw], and koinonos [koinwnov"] —in the New Testament corresponds to general Greek usage. Thus the fellowship and sharing are religious or specifically Christian only if the context requires this meaning. For example, in ac 2:42 we encounter the word Koinonia [koinwniva] and read that the new converts continued in "the apostles' teaching and to the fellowship." Here it is a normal meaning adapted to Christian usage. Then the verb, koinonein [koinwnevw], is found in Hebrews 2:14 with an ordinary, general meaning: "children share flesh and blood." Likewise, koinonos [koinwnov"] occurs with the meaning of "partner" in Luke 5:10—" [James and John] … Simon's partners. "
However, it is especially, but not solely, in the writings of the apostle Paul that the theological dimension of koinonia, [koinwniva] "fellowship/sharing/participation" is developed and clearly presented. Here the normal meanings of the words are transformed in service of the kingdom of God and as they identify a sharing in the communion of the blessed and Holy Trinity. That is, they point specifically to the supernatural life of God given to and shared with humankind through Jesus Christ in the Holy Spirit. The emphasis of the New Testament is also on participation in something that is an objective reality rather than on an association with someone

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