The word alone comes from a combination of the Middle English words "all" and "one," which is really all you need to know to understand the word. A person who is alone is all-in-one; there's no one else around.

Depending how you look at it, the word alone can have positive or negative connotations. A person with a bad attitude that no one wants to be around might find himself alone much of the time. But someone seeking solitude, might choose to be alone. Then there are those people or things that are so unique or special that they alone possess a certain quality. Superman alone could save the world from the evil hand of Lex Luthor.

Definitions of alone

adj isolated from others

“could be alone in a crowded room”
“was alone with her thoughts”
“I want to be alone
not seeking or given to association; being or living without companions

adj lacking companions or companionship

“he was alone when we met him”
“she is alone much of the time”
lone, lonely, solitary
being without an escort

adj exclusive of anyone or anything else

“she alone believed him”
“cannot live by bread alone
excluding much or all; especially all but a particular group or minority

adj radically distinctive and without equal

“he is alone in the field of microbiology”
“this theory is altogether alone in its penetration of the problem”
unequaled, unequalled, unique, unparalleled
incomparable, uncomparable
such that comparison is impossible; unsuitable for comparison or lacking features that can be compared

adv without anybody else or anything else

“the child stayed home alone
“the pillar stood alone, supporting nothing”
solo, unaccompanied

adv without any others being included or involved

“the burden of proof rests on the prosecution alone
entirely, exclusively, only, solely

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