It is a noun.
Meaning : It refers to the short duration period of anything.It is also the quality which shows the talent of expressing much within few words .It indicates the conciseness of the expression .
Root of the word : BREV = short
Etymology: Latin word brevitas
Synonyms : conciseness, concision, succinctness, pithiness, terseness, briefness
Antonyms: verbosity, garrulity,lengthy
1)Brevity is the soul of wit.
2)I have to complete this work within the brevity given to me.
3)Her brevity itself shows her talent and she is suitable for this job.
4)Our coordinator gave a brevity presentation regarding the project so that we all get its overview.