I. əbˈzərvəbəl, -zə̄v-, -zəiv- adjective
Etymology: French, from Latin observabilis, from observare to observe + -abilis -able — more at observe
1. : requiring or suitable to be observed, regarded, or kept
a very observable old custom
forms observable in social intercourse
2.
a. : deserving or observation : noteworthy
b. obsolete : remarkable , notable
3. : capable of being observed : discernible , detectable , noticeable
an observable decline in health
an observable phenomenon
• ob·serv·able·ness -bəlnə̇s noun -es
• ob·serv·ably -blē, -li adverb
II. noun
( -s )
1. archaic : something noteworthy or unusual
2. : an event that is perceptible directly or indirectly (as by the medium of instruments) through the senses : phenomenon
such observables as size, energy, momentum, or viscosity