Observational

//ˌɑbzɚˈveɪʃənəl// adj

Definitions

Adjective
  1. 1
    Relating to observation, especially scientific observation.

    "The essential fact is simply that all the pictures which science now draws of nature, and which alone seem capable of according with observational fact, are mathematical pictures."

Adjective
  1. 1
    relying on observation or experiment wordnet

Etymology

From observation + -al.

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