What is the meaning of ba?

noun

• A soft silvery metallic element of the alkali earth group; found in barite.
  • synonyms: barium, atomic number 56
• A bachelor's degree in arts and sciences.
  • synonyms: Bachelor of Arts, Artium Baccalaurens, AB
• A person who is deemed to be despicable or contemptible.
  • usage: "only a rotter would do that"; "kill the rat"; "throw the bum out"; "you cowardly little pukes"; "the British call a contemptible person a `git'"
  • synonyms: rotter, dirty dog, rat, skunk, stinker, stinkpot, bum, puke, crumb, lowlife, scum bag, so-and-so, git
• A disreputable vagrant.
  • usage: "a homeless tramp"; "he tried to help the really down-and-out bums"
  • synonyms: tramp, hobo, bum
• Person who does no work.
  • usage: "a lazy bum"
  • synonyms: idler, loafer, do-nothing, layabout, bum
• The fleshy part of the human body that you sit on.
  • usage: "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing"
  • synonyms: buttocks, nates, arse, butt, backside, bum, buns, can, fundament, hindquarters, hind end, keister, posterior, prat, rear, rear end, rump, stern, seat, tail, tail end, tooshie, tush, bottom, behind, derriere, fanny, ass