From koinonos; communicative, i.e. (pecuniarily) liberal -- willing to communicate.
see GREEK koinonos
1. social, sociable, ready and apt to form and maintain communion and fellowship: Plato, deff., p. 411 e.; Aristotle, pol. 3,13 (p. 1283a, 38; eth. Eudem. 8, 10, p. 1242a, 26 κοινωνικον ἄνθρωπος ζοων); Polybius 2, 44,1; Antoninus 7, 52. 55; often in Plutarch; πράξεις κοινωνικαι, actions having reference to human society, Antoninus 4, 33; 5, 1.
2. inclined to make others sharers in one's possessions, inclined to impart, free in giving, liberal (Aristotle, rhet. 2, 24, 2 (where, however, see Cope); Lucian, Tim. 56): 1 Timothy 6:18.