Question

alone
I
 /əˈloʊn/  adj  , not used before a noun
  1 a : without anyone or anything else : not involving or including anyone or anything else : separate from other people or things
   I was all alone [=by myself] in the office yesterday.
   This wine goes well with food, but is also very good alone.
   I got him alone and asked him what had really happened.
   She lived alone for many years.
   She doesn't mind being alone because she never feels lonely/lonesome.
   He was alone with his thoughts.
  1 b : without people that you know or that usually are with you
   This is the first time the couple has been out alone together since the birth of their child. [=the first time they have gone somewhere without their child]
   He traveled alone [=by himself] to visit his grandparents when he was only seven.
   She was nervous about being (all) alone in the city when she started her new job.
  ◇ If you are not alone when you do something, you are not the only person who is doing it.
   She's worried about losing her job, and she's not alone. [=other people are also worried about losing their jobs]
   He was not alone in calling for reform. Many people were demanding changes.
  2 [more ~; most ~] : feeling unhappy because of being separated from other people
   He felt very alone when he went away to school.
————————
II
  adv  
  1 : without help from anyone or anything else
   She raised six children alone. [=on her own, by herself]
   The police believe the criminal acted alone.
   Medication alone [=by itself] won't relieve the symptoms entirely.
  2 : without another
  — used for emphasis
   The proof rests on one witness's statement alone.
   You alone [=only you] can decide what needs to be done. [=you are the only one who can decide]
   You alone are responsible. = The responsibility is yours alone.
   The blame is mine and mine alone. [=I am the only one who should be blamed]
  3 : without including or needing anything more
   You can't rely on your looks alone [=you can't rely just on your looks]; you'll need to work very hard.
   The price alone is enough to discourage people.
   The special effects alone make the movie worth seeing.
  go it alone
   : to do something by yourself
    If no one's willing to help me, I guess I'll just have to go it alone.
  leave (someone or something) alone — see leave, 1
  leave well enough alone — see leave, 1
  let alone — see let, 1
  stand alone — see stand, 1