The Collaborative International Dictionary
Observableness
Observable \Ob*serv"a*ble\, a. [L. observabilis: cf. F. observable.]
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Capable of being observed; discernible; noticeable.
--Sir. T. Browne.The difference is sufficiently observable.
--Southey. Worthy of being observed; important enough to be noted or celebrated; as, an observable anniversary.
Noteworthy; remarkable. [PJC] -- Ob*serv"a*ble*ness, n. -- Ob*serv"a*bly, adv.