adjective (used predicatively)
separate, apart, or isolated from others: I want to be alone.
to the exclusion of all others or all else: One cannot live by bread alone.
unique; unequaled; unexcelled: He is alone among his peers in devotion to duty.
solitarily; solely: She prefers to live alone.
only; exclusively.
without aid or help: The baby let go of the side of the crib and stood alone.
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.
let alone,
to refrain from annoying or interfering with.
not to mention: He was too tired to walk, let alone run.
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.

1250–1300; Middle English al one all (wholly) one

aloneness, noun

1. single, solitary; unaccompanied, unattended. Alone, lone, lonely, lonesome all imply being without companionship or association. Alone is colorless unless reinforced by all; 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. accompanied.

7, 8. See leave1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alone (əˈləʊn)
adj, —adv
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 be to refrain from annoying or interfering with
6.  leave well alone, leave well enough alone, let well alone, let well enough alone to refrain from interfering with something that is satisfactory
7.  let alone much less; not to mention: he can't afford beer, let alone whisky
[Old English al one, literally: all (entirely) one]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300 contraction of O.E. all ana "all by oneself," from all "all, wholly" + an "one" (see one). Similar compounds found in Ger. (allein) and Du. (alleen).
Online Etymology Dictionary, © 2010 Douglas Harper
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