navigability|nævɪgəˈbɪlɪtɪ| [f. next + -ity.] The fact or quality of being navigable. 1846in Worcester.1865Reader 15 Apr. 415/2 It was said that the navigability of the Thames would be injuriously affected.1889Law Times LXXXVII. 290/1 This excludes the notion of navigability.