7 letters · 14 points in Scrabble
verb establish or strengthen as with new evidence or facts
verb strengthen or make more firm
verb make more firm
originFrom Middle English confirmen, confermen, from Old French confermer, from Latin cōnfirmāre (“to make firm, strengthen, establish”), from con- (“together”) + firmāre (“to make firm”), from firmus (“firm”).
Etymology from Wiktionary, CC BY-SA 3.0