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Definition of alone : 1. Hence; Unique; rare; matchless.
2. Of or by itself; by themselves; without any thing more or any one else; without a sharer; only.
3. Quite by one's self; apart from, or exclusive of, others; single; solitary; - applied to a person or thing.
4. Sole; only; exclusive.
5. Solely; simply; exclusively.

Synonyms:

only if, unique, only when, altogether, apart, desolate, all, uncomparable, incomparable, companionless, nonpareil, forlorn, merely, unaccompanied, entirely, unexampled, lorn, removed, unequalled, peerless, matchless, isolate, exclusive, lonesome, solo, forsaken, separate, unparalleled, deserted, unsocial, exclusively, completely, whole, single-handed, singly, unrivaled, include, unmatched, simply, just, wholly, totally, but, singular, same, abandoned, unequaled, only, solely, individual

intact, abstemious, maiden, spinsterish, solitary, single, asexual, pure, unmarried, ascetic, abstinent, lone, unwed, chaste, virgin, monkish, unplowed, virginal, bachelor, celibate, monastic, old maid

ejected, aloof, excommunicated, closeted, confined, secluded, maverick, hermitic, segregated, alienated, xenophobic, antisocial, cloistered, reclusive, blackballed, separated, blacklisted, exiled, ostracized, anonymous, expatriated, banished, lonely, cordoned, sequestered, disbarred, eliminated, deported, outcast, detached, isolated, boycott, extirpated, misanthropic, extradited, excluded

let alone, ignore, neglect

Usage examples:

• She was to be alone all day. - "Tip Lewis and His Lamp", Pansy.
• All alone, were you?" - "Master Tales of Mystery, Volume 3", Collected and Arranged by Francis J. Reynolds.
• " Just leave me alone, all right? - "Down and Out in the Magic Kingdom", Cory Doctorow.