D defs.my
Entry 3 senses Webster, 1913

Observable

/əb-zẽrv'-əb-əl/ · Ob·serv·a·ble · IPA /əbˈzɜː.və.bəl/
01 a. Capable of being observed; discernible; noticeable.
  1. 1.
    Capable of being observed; discernible; noticeable.
    “The difference is sufficiently observable.” Southey.
  2. 2.
    Worthy of being observed; important enough to be noted or celebrated; as, an observable anniversary.
  3. 3.
    Noteworthy; remarkable.