This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Possible to observe: observable phenomena; an observable change in demeanor. See Synonyms at noticeable.

adj. Deserving or worthy of note; noteworthy: an observable anniversary.

n. 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.

adj. Able to be observed.

adj. Deserving to be observed.

n. Any physical property that can be observed and measured directly and not derived from other properties

adj. Capable of being observed; discernible; noticeable.

adj. Worthy of being observed; important enough to be noted or celebrated.

adj. Noteworthy; remarkable.

Capable of being observed or noticed, or viewed with interest or attention.

Noticeable; worthy of observation; noteworthy; hence, remarkable.

That may or must be observed, followed, or kept: as, the formalities observable at court.

n. A noticeable or noteworthy fact or thing; something worth observing.

adj. capable of being seen or noticed

"Because we have to admit that we can observe only a relatively small patch of the Universe, which we call our observable Universe and we are limited by an observation horizon beyond which we will never be possible to look through."

noticeable   

discernible    noticeable    noteworthy    remarkable   

measurable    discernible    traceable    demonstrable    noticeable    verifiable    relevant    applicable    beneficial    distinguishable