Something observable can be perceived or detected — you can see it, hear it, or otherwise sense that it's there. An observable change in the temperature outdoors will make you run back in for your hat and gloves.

If an observable hush falls over the dining room when your grandfather clears his throat, it's something that everyone notices. Observable differences between you and your twin sister might include different haircuts and the fact that you wear glasses but she doesn't. Observable things can be sensed (perceived with one of your five senses) or intuited.

Definitions of observable
  1. adjective
    capable of being seen or noticed
    “an observable change in behavior”
    synonyms: discernible, evident
    capable or worthy of being perceived
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