† ˈextanceObs.rare—1. [ad. L. ex(s)tantia, n. of state f.ex(s)tant-em, pr.pple. of ex(s)tāre: see extant.] Emergence. 1682Sir T. Browne Chr. Mor. (1756) 127 He..who hath in his intellect the ideal existences of things, and entities before their extances.