What is the meaning of Hallo?

Alternative form of hello

A cry of surprise.

The cry "hallo!"

A shout of exultation.

To shout, or to call with a loud voice.

To chase while shouting "hallo!"

To cry "hallo" (to someone).

To shout (something).

hello

hello (a greeting usually used to answer the telephone)

An exclamation to get attention.

n hello ("Hello!" or an equivalent greeting)

hello (a general greeting used when meeting somebody)

hello (exclamation to indicate oneself, which usually is used when starting a telephone call)

an exclamation indicating wonder, demand, disapproval

hello (a general greeting used when meeting someone)

hello (a greeting usually used to answer the telephone or when meeting somebody)

dative/ablative singular of hallus

hello (greeting)

hello (greeting)

hello

first-person singular present indicative of hallar

hello

Source: wiktionary.org