UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/əˈləʊn/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/əˈloʊn/ ,USA pronunciation: respelling(ə lōn)

WordReference Random House Learner's Dictionary of American English © 2020
a•lone /əˈloʊn/USA pronunciation   adj. 
  1. separate, apart;
    by oneself:[be + ~]alone in the wilderness.
  2. to the exclusion of all others or all else:[after a noun or pronoun]You can't live by bread alone.
  3. [be + ~] unequaled;
  4. only;
    nothing else being necessary:[after a noun]Her name alone was enough to draw a crowd.

  1. by oneself:She lives alone.
  2. solely;
    exclusively:This glassware is sold by us alone.
  3. without aid or help:The baby can stand alone.
  1. Idioms leave or let alone, [leave/let + object + ~] to refrain from bothering or interfering with:left him alone with his thoughts.
  2. Idioms leave or let well enough alone, to leave things as they are:Let's leave well enough alone and stop tinkering.
  3. Idioms let alone, not to mention:too tired to walk, let alone run.

a•lone•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2020
a•lone  (ə lōn),USA pronunciation adj. (used predicatively)
  1. separate, apart, or isolated from others:I want to be alone.
  2. to the exclusion of all others or all else:One cannot live by bread alone.
  3. unique;
    unexcelled:He is alone among his peers in devotion to duty.
  4. leave alone: 
    • to allow (someone) to be by himself or herself:Leave him alone--he wants to rest.
    • to refrain from annoying or interfering with:The youngsters wouldn't leave the dog alone, and he finally turned on them.
  5. let alone: 
    • to refrain from annoying or interfering with.
    • not to mention:He was too tired to walk, let alone run.
  6. let well enough alone, to be satisfied with the existing situation;
    refrain from attempting to change conditions:Marriages are often destroyed by relatives who will not let well enough alone.

  1. solitarily;
    solely:She prefers to live alone.
  2. only;
  3. without aid or help:The baby let go of the side of the crib and stood alone.
a•loneness, n. 
  • Middle English al one all (wholly) one 1250–1300
    • 1.See corresponding entry in Unabridged single, solitary;
      unaccompanied, unattended.
      Alone, lone, lonely, lonesome all imply being without companionship or association.
      Alone is colorless unless reinforced by
      it then suggests solitariness or desolation:alone in the house; all alone on an island.Lone is somewhat poetic or is intended humorously:a lone sentinel.Lonely implies a sad or disquieting feeling of isolation.
      Lonesome connotes emotion, a longing for companionship.
    • 1.See corresponding entry in Unabridged accompanied.
    4, 5. See  leave1. 

Collins Concise English Dictionary © HarperCollins Publishers::
alone /əˈləʊn/ adj , adv (postpositive)
  1. apart from another or others; solitary
  2. without anyone or anything else: one man alone could lift it
  3. without equal; unique: he stands alone in the field of microbiology
  4. to the exclusion of others; only: she alone believed him
  5. leave alone, leave be, let alone, let beto refrain from annoying or interfering with
  6. leave well alone, leave well enough alone, let well alone, let well enough aloneto refrain from interfering with something that is satisfactory
  7. let alonemuch less; not to mention: he can't afford beer, let alone whisky
Etymology: Old English al one, literally: all (entirely) one
'alone' also found in these entries:

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