hallo/həˈləʊ/EtymologyFrom Middle English halou, halow, halloo (interjection used to call attention), representing Old English hēlā, ǣlā, ēalā (“O!, alas!, oh!, lo!”), equivalent to hey + lo.hallo means A cry of surprise. Lexicurio rates it Rare gem — a strength score of 83 out of 100.intjA cry of surprise.“It sounds like a sum in the rule of three. The answer should give us the— But hallo! here are the accredited representatives of the law.”nounThe cry "hallo!"A shout of exultation.verbTo shout, or to call with a loud voice.“Tom was just hiding behind a wall, […] but the groom saw him, and halloed to him to know where Mr. Grimes, the chimney-sweep, lived.”To chase while shouting "hallo!"To cry "hallo" (to someone).To shout (something).