It is an adjective.
Meaning : It is used to refer to the talkativeness of a person.It means very much tending to talk more.It is also used to indicate an event which has been characterized by excessive talk.
Root of the word: locu/loqu/logue/logy/lix means speak, speech
Synonyms: talkative, garrulous, rambling, long-winded, effusive,babbling,chattering,chatty,prolix,voluble,verbose
loquaciously - adverb
loquaciousness - noun
1)The loquacious speaker kept on talking for three hours.
2)This has become the most loquacious play of the season.
3)His loquaciousness had brought him to this stage.