13 letters · 16 points in Scrabble
noun a show or display; the act of presenting something to sight or view
noun a show of military force or preparedness
noun a public display of group feelings (usually of a political nature)
originFrom Middle English demonstracioun, from Old French demonstration, from Latin dēmōnstrātiōnem, from dēmōnstrāre (“show or explain”), from dē- (“of or concerning”) + mōnstrāre (“show”). Morphologically demonstrate + -ion.
Etymology from Wiktionary, CC BY-SA 3.0