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observable
This term describes things that can be detected through direct perception or precise measurement. In general usage, it carries a neutral, objective tone, suggesting that the evidence is available for anyone to see provided they have the right tools or attention. In scientific and mathematical contexts, the noun form refers to a specific quantity that can be measured. Unlike a theoretical construct or a hidden variable, an observable is a concrete data point that validates a hypothesis through empirical evidence.
Meanings
Able to be noticed, seen, or measured using a scientific instrument or the human senses.
"The changes in the patient's condition were clearly observable over the next few days."