Bougainvillean adjective 1noun 1forms 3 adjective1 •Of, from or relating to Bougainville.Slipping into a reflective mood, Mr. Kinna, 36 years old, recalled his Bougainvillean childhood. — 1986 noun1 •A native or inhabitant of Bougainville.“Nobody has ever asked us what we wanted,” a resentful Bougainvillean told a visitor, alluding to the copper development as well as the colonial history. — 1971 formsBougainvilleans · more Bougainvillean · most Bougainvillean