An only child.
Alone in a category.
Singularly superior; the best.
Without sibling; without a sibling of the same gender.
Mere.
Without others or anything further; exclusively.
No more than; just.
As recently as.
Used to express surprise or consternation at an action.
Introduces a disappointing or surprising outcome that renders futile something previously mentioned. See also only to, only for.
Above all others; particularly.
Under the condition that; but.
But; except.