A demonstrable fact or quality can be shown to be true or to exist.
FORMAL adj usu ADJ n
The road safety programme is having a demonstrable effect on road users...
...demonstrably false statements.
Translation English - Cobuild Collins Dictionary
attestable, axiomatic, certain, evident, evincible, incontrovertible, indubitable, irrefutable, obvious, palpable, positive, provable, self-evident, undeniable, unmistakable, verifiable
English Collins Dictionary - English synonyms & Thesaurus
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"