What is the meaning of Tweet?

The sound of a bird; any short high-pitched sound or whistle.

An entry posted on the microblogging service Twitter.

An entry on any microblogging service.

To make a short high-pitched sound, like that of certain birds.

To post an update to Twitter.

To post an update to any microblogging site.

Used to represent the sound of a bird twittering: twit.

tweet

tweet (Twitter)

imperative of tweete

tweet (Twitter message)

a tweet (a message on Twitter)

tweet (entry posted on Twitter)

tweet (entry posted on Twitter)

tweet

tweet (message on Twitter)

tweet (entry posted on Twitter)

Source: wiktionary.org