numeral ダウンロード 🔗共有 十九 The cardinal number occurring after eighteen and before twenty, represented in Roman numerals as XIX and in Arabic numerals as 19. It is the last/largest of the "teens". Examples : "My little sister turned nineteen yesterday. " 妹は昨日19歳になりました。 number math AIとチャット語彙ゲーム読解練習