What does "demonstrably" mean?
In such a manner that is capable of being demonstrated, shown, or proved (without doubt).
adv ·Uncommon ·Advanced level
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"The country has become demonstrably less safe under his leadership."
"As liberty of thought is absolute, so is liberty of speech, which is "inseparable" from the liberty of thought. Liberty of speech, moreover, is essential not only for its own sake but for the sake of truth, which requires absolute liberty for the utterance of unpopular and even demonstrably false opinions."
In such a manner that is capable of being demonstrated, shown, or proved (without doubt).
Common synonyms include: actually, assuredly, behaviourally, certainly, clearly, clearly evidenced.
As liberty of thought is absolute, so is liberty of speech, which is "inseparable" from the liberty of thought. Liberty of speech, moreover, is essential not only for its own sake but for the sake of truth, which requires absolute liberty for the utterance of unpopular and even demonstrably false opinions.
Pronounced /diˈmɑnstrəbli/.
From demonstrable + -ly. First attested in the early 17th century.