demonstrate
definition
to show or prove something clearly through evidence or examples
example
The scientist was able to demonstrate the effectiveness of the new drug through a series of rigorous tests.
synonyms
showillustrateexhibit
word origin — from Middle English 'demonstraten', from Latin 'demonstrāre' meaning 'to point out, show' (composed of 'de-' meaning 'down, from' and 'monstrare' meaning 'to show')