What is the meaning of about?

adjective

• On the move.
  • usage: "up and about"; "the whole town was astir over the incident"
  • synonyms: astir

adverb

• Of quantities. ( imprecise but fairly close to correct)
  • usage: "lasted approximately an hour"; "in just about a minute"; "he's about 30 years old"; "I've had about all I can stand"; "we meet about once a month"; "some forty people came"; "weighs around a hundred pounds"; "roughly $3, 000"; "holds 3 gallons, more or less"; "20 or so people were at the party"
  • synonyms: approximately, close to, just about, some, roughly, more or less, around, or so
• All around or on all sides.
  • usage: "dirty clothes lying around (or about)"; "let's look about for help"; "There were trees growing all around"; "she looked around her"
  • synonyms: around
• In the area or vicinity.
  • usage: "a few spectators standing about"; "hanging around"; "waited around for the next flight"
  • synonyms: around
• Used of movement to or among many different places or in no particular direction.
  • usage: "wandering about with no place to go"; "people were rushing about"; "news gets around (or about)"; "traveled around in Asia"; "he needs advice from someone who's been around"; "she sleeps around"
  • synonyms: around
• In or to a reversed position or direction.
  • usage: "about face"; "suddenly she turned around"
  • synonyms: around
• In rotation or succession.
  • usage: "turn about is fair play"
• Of actions or states. ( slightly short of or not quite accomplished; all but)
  • usage: "the job is (just) about done"; "the baby was almost asleep when the alarm sounded"; "we're almost finished"; "the car all but ran her down"; "he nearly fainted"; "talked for nigh onto 2 hours"; "the recording is well-nigh perfect"; "virtually all the parties signed the contract"; "I was near exhausted by the run"; "most everyone agrees"
  • synonyms: almost, most, nearly, near, nigh, virtually, well-nigh