A.buy together, collect by purchase, “νησιῶται ἵππον συνωνέονται μυρίην” Hdt.1.27.
II. buy up, “σῖτον” Lys.22.6, X.HG 5.4.56; “μαθήματα” Pl.Sph.224b; “θηρία” Plu.Brut.21:—Pass., “προσέταξεν [χρυσὸν] συνωνηθῆναι” POxy.2106.4 (iv A.D.):—the pf συνεώνημαι is used as Pass., ὁ συνεωνημένος [σῖτος] corn bought up, Lys.22.12; but with act. sense in D.13.30, 23.208.
III. assist one to buy, Thphr.Char.2.7.