Definitions from Wiktionary ( )

▸ noun:  The sound of a bird; any short high-pitched sound or whistle.
▸ noun:  (social media) An entry posted on the microblogging service Twitter.
▸ noun:  (social media, by extension) An entry on any microblogging service.
▸ verb:  (intransitive) To produce a short high-pitched sound, similar to that of certain birds.
▸ verb:  (ambitransitive, social media) To post an update to Twitter.
▸ verb:  (ambitransitive, social media, by extension) To post an update to any microblogging site.
▸ noun:  A surname.
▸ noun:  Alternative letter-case form of tweet (“Twitter post”) [The sound of a bird; any short high-pitched sound or whistle.]
▸ verb:  Alternative letter-case form of tweet (“to post on Twitter”) [(intransitive) To produce a short high-pitched sound, similar to that of certain birds.]

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