Demonstrably

//diˈmɑnstrəbli// adv

Definitions

Adverb
  1. 1
    In such a manner that is capable of being demonstrated, shown, or proved (without doubt).

    "The country has become demonstrably less safe under his leadership."

Adverb
  1. 1
    in an obvious and provable manner wordnet

Etymology

From demonstrable + -ly. First attested in the early 17th century.

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