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Synonyms
ob·serv·a·ble (əb-zûŕvə-bəl)

adjective 

  1. Possible to observe: observable phenomena; an observable change in demeanor. See synonyms at noticeable
  2. Deserving or worthy of note; noteworthy: an observable anniversary.

noun 

A physical property, such as weight or temperature, that can be observed or measured directly, as distinguished from a quantity, such as work or entropy, that must be derived from observed quantities.

derivatives

ob·serv́a·bly
adverb