coadjuvancyrare.|kəʊˈædʒ(j)uːvənsɪ| [f. as next.: see -ancy.] Coadjuvant quality or action; co-operating assistance. 1646Sir T. Browne Pseud. Ep. ii. i. 54 Some concurrence or coadjuvancy.1879Lingham Science Taste Conclus. 250 The efficaciousness of State coadjuvancy.