[dih-mon-struh-buh l, dem-uh n-]


capable of being demonstrated or proved.
clearly evident; obvious: a demonstrable lack of concern for the general welfare.

Origin of demonstrable

1350–1400; Middle English < Old French < Late Latin dēmonstrābilis, equivalent to Latin dēmonstrā(re) (see demonstrate) + -bilis -ble
Related formsde·mon·stra·bil·i·ty, de·mon·stra·ble·ness, nounde·mon·stra·bly, adverbnon·de·mon·stra·bil·i·ty, nounnon·de·mon·stra·ble, adjectivenon·de·mon·stra·ble·ness, nounnon·de·mon·stra·bly, adverbun·de·mon·stra·ble, adjectiveun·de·mon·stra·ble·ness, nounun·de·mon·stra·bly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for demonstrably

Contemporary Examples of demonstrably

Historical Examples of demonstrably

  • If it does not hear the signal, it is demonstrably off the straight route.

  • These are the two most popular theories, and both are demonstrably false.

    Henry VIII.

    A. F. Pollard

  • It is not a question of what is demonstrably best, but of what best suits you.

    Art in Needlework

    Lewis F. Day

  • Yet it was demonstrably the injection that killed Overbury if he was killed by poison at all.

    She Stands Accused

    Victor MacClure

  • Meilhan was demonstrably lying to conceal Mme Lacoste's liberality.

    She Stands Accused

    Victor MacClure

British Dictionary definitions for demonstrably



able to be demonstrated or proved
Derived Formsdemonstrability or demonstrableness, noundemonstrably (ˈdɛmənstrəblɪ, dɪˈmɒn-), adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for demonstrably



c.1400, from Latin demonstrabilis, from demonstrare (see demonstration). Related: Demonstrably.

Online Etymology Dictionary, © 2010 Douglas Harper